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Reviewed on Aug 17, 2018 , Dimitris Katsaounis, Yannick Khong

LG 27UK650
MONITOR REVIEW

Usage Ratings - Version 1.0

Test Benches:

  • 1.0: Fall 2017
7.9
Mixed Usage
Score components:
  • 30% Office
  • 30% Multimedia
  • 25% Gaming
  • 10% Media Creation
  • 5% HDR Gaming
Size : 27 "
Resolution : 3840x2160
Refresh Rate : 60 Hz
LCD Type
What it is: Type of LCD technology used by the monitor.
When it matters: Different technologies have different viewing angle properties.
:
IPS
Variable Refresh Rate
What it is: Feature that allows the monitor to synchronize its refresh rate with the input device's output and reduces stuttering and screen tearing.
When it matters: Almost every usage, but is most noticeable in gaming where constant fluctuation in framerate cause distracting artifacts.
:
FreeSync

The LG 27UK650-W is a very good 27-inch IPS LCD monitor with HDR support, low input lag for gaming and great SDR peak brightness. It has a very good picture quality, wide viewing angles and a great resolution that will display every little detail. Although the monitor supports HDR, you will not benefit much from using it in this mode. It is more suitable for average lit environments where it can handle reflections and glare well. In dark rooms, blacks appear gray.

Test Results
Design 7.5
Picture Quality 7.5
Motion 8.0
Inputs 9.0
Pros
  • Excellent resolution and size allow for multitasking
  • Input lag is very low
  • Wide viewing angles
Cons
  • Lacking HDR performance
  • No local dimming support

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White 27UK650-W
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Amazon.com
7.5

Design

Score components: Subjectively assigned
LG 27UK650 Design Picture
Curved : No
Curve radius : N/A
Weight (without stand) : 9.9lbs (4.5 kg)
Weight (with stand) : 13.4lbs (6.1 kg)

The design of the LG 27UK650 is good. The stand supports the monitor well and although it will wobble if knocked, the entire monitor is sturdy. The ergonomics are decent, but unfortunately, the monitor can not swivel so the stand moves along every time you rotate the monitor left or right. The build quality is decent and although the monitor does not feel premium you should have no problems with it. There is very little cable management provided, only a ring that attaches to the main stand.

Stand
LG 27UK650 Stand picture
Width : 17.9" (45.5 cm)
Depth : 9.1" (23.0 cm)

The stand is plastic and curved. It looks clean and supports the monitor well. The monitor will wobble a little if you knock it. It has an average footprint.

6.2 Ergonomics
What it is: How much the position of the screen can be adjusted to match the viewing preference of the user.
When it matters: All usages, but especially office and gaming use.
Score components:
  • 46% Height Adjustment
  • 18% Switch portrait/landscape
  • 18% Swivel Range
  • 18% Tilt Range
LG 27UK650 Ergonomics picture
Height Adjustment : 4.3" (11.0 cm)
Switch portrait/landscape : Yes
Swivel Range : N/A
Tilt Range : -17.5° to 2.5°

The ergonomics of the LG 27UK650-W are mediocre. The stand allows some adjustments to be made to the monitor including switching to portrait mode. If you need to swivel it to show something to someone sitting on the side, you will need to rotate the whole monitor including the stand as it can't swivel.

Back
LG 27UK650 Back picture
Wall Mount : VESA 100x100

The back of the monitor is very plain and there is only basic cable management with the aid of a ring attached to the main stand.

Borders
LG 27UK650 Borders picture
Borders : 0.3" (0.8 cm)

The borders are very thin and elegant.

Thickness
LG 27UK650 Thickness picture
Thickness (with stand) : 5.6" (14.3 cm)
Thickness (without stand) : 1.7" (4.2 cm)

The monitor has an average thickness when it is on its stand. If you choose to VESA mount it then it will look significantly thinner and will not protrude.

6.5 Build Quality
What it is: How well built and sturdy the monitor is, and how good the materials used to build it are.
When it matters: All usages.
Score components: Subjectively assigned
LG 27UK650 Build Quality picture

The build quality is decent. There are no gaps and you should not have any issues with this monitor. On the other hand, it feels plastic and does not have a premium construction.

The picture quality of the LG 27UK650-W is good. The monitor is more suitable for bright spaces due to its good SDR brightness and good reflection handling. You should avoid placing this monitor in a dark room as you will not get deep blacks due to the low contrast ratio. Viewing angles are good and color accuracy is very good. The coverage of color spaces in SDR will keep most people happy, except media publishing professionals. Finally, although the monitor supports HDR, its performance is only mediocre and will not satisfy HDR enthusiasts. 

6.3 Contrast
What it is: Brightness difference between white and black. This is the main component of picture quality.
When it matters: Always, but especially when watching dark scenes.
Score components:
LG 27UK650 Checkerboard Picture
Native Contrast
What it is: Ratio of the white brightness divided by the blacks measured on our checkerboard test pattern with a white target of 100 cd/m².
When it matters: Dark scenes in a dark room.
Good value: > 3,000
Noticeable difference: 500
:
1196 : 1
Contrast with local dimming
What it is: Ratio of the white brightness divided by the blacks measured on our checkerboard test pattern with local dimming turned on (maximum) with a white target of 100 cd/m².
When it matters: Dark scenes in a dark room.
Good value: > 3,000
Noticeable difference: 500
:
N/A

The contrast ratio is mediocre, but this is expected for an IPS monitor. In darker rooms, blacks will look more like gray.

0 Local Dimming
What it is: The lights behind the LCD layer adapt to the picture displayed, improving the contrast ratio.
When it matters: Dark scenes viewed in a dark room.
Score components: Subjectively assigned
Local Dimming
What it is: Whether it has a feature that controls the LEDs behind the LCD layer, to match the picture and darkens the dark portion of it.
When it matters: On LED TVs only. Dark scenes viewed in a dark room.
:
No
Backlight
What it is: Configuration of the lights of the backlight.
When it matters: Effectiveness of the local dimming.
Good value: Full-array/direct lighting is better for local dimming. As for the uniformity of the screen, it depends on the implementation. Some edge-lit monitors have more uniform blacks than some full-array monitors.
:
Direct

The LG 27UK650 does not have a local dimming feature. The video is for reference only.

8.0 SDR Peak Brightness
What it is: How bright the screen can get. Measured with local dimming and with SDR content.
When it matters: Bright living rooms; bright objects; SDR content.
SDR Real Scene
What it is: The maximum luminosity the TV can obtain while playing a movie or while watching a TV show. Our Real Scene was selected to represent a more regular movie condition. All measurements are made with the TV set to be as bright as possible, but with a 6500k white. Measured with local dimming on, max backlight and with an SDR signal. Scene: here.
When it matters: When watching movies and TV shows in SDR.
:
352 cd/m²
SDR Peak 2% Window
What it is: The maximum luminosity, even if only maintained for a short time, of a white square covering 2% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: Bright highlights, present on screen for a short time
:
351 cd/m²
SDR Peak 10% Window
What it is: The maximum luminosity, even if only maintained for a short time, of a white square covering 10% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: Bright objects, present on screen for a short time
:
352 cd/m²
SDR Peak 25% Window
What it is: The maximum luminosity, even if only maintained for a short time, of a white square covering 25% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
:
352 cd/m²
SDR Peak 50% Window
What it is: The maximum luminosity, even if only maintained for a short time, of a white square covering 50% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
:
352 cd/m²
SDR Peak 100% Window
What it is: The maximum luminosity, even if only maintained for a short time, of a white square covering 100% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
:
350 cd/m²
SDR Sustained 2% Window
What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 2% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: Bright highlights, persistent during a scene.
:
350 cd/m²
SDR Sustained 10% Window
What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 10% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: Bright objects, persistent during a scene.
:
351 cd/m²
SDR Sustained 25% Window
What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 25% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
:
351 cd/m²
SDR Sustained 50% Window
What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 50% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
:
351 cd/m²
SDR Sustained 100% Window
What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 100% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
:
350 cd/m²
SDR ABL
What it is: The standard deviation of the SDR sustained brightness, after linearizing for noticeable differences in luminosity
When it matters: Content with large bright areas, such as for PC or video game use, and sports such as hockey
:
0.000

Great SDR peak brightness for the LG 27UK650. The monitor is suitable for a bright room as it can get bright enough to overcome glare. It is also nice that the same level of brightness is measured at all windows sizes. Its brightness level is higher than that of sister monitors LG 27UD68-W and LG 27UD58-B.

6.6 HDR Peak Brightness
What it is: How bright the screen can get. Measured with local dimming and with HDR content.
When it matters: HDR content
HDR Real Scene : 385 cd/m²
HDR Peak 2% Window : 360 cd/m²
HDR Peak 10% Window : 361 cd/m²
HDR Peak 25% Window : 361 cd/m²
HDR Peak 50% Window : 361 cd/m²
HDR Peak 100% Window : 377 cd/m²
HDR Sustained 2% Window : 357 cd/m²
HDR Sustained 10% Window : 359 cd/m²
HDR Sustained 25% Window : 360 cd/m²
HDR Sustained 50% Window : 360 cd/m²
HDR Sustained 100% Window : 361 cd/m²
HDR ABL : 0.001

Decent HDR brightness for the LG 27UK650-W. The real scene is brighter because the uniformity isn't good. Some zones like the center of the screen are a bit dimmer than the rest, and this is what causes the difference between the test patterns and the real scene.

Update 08/17/2018: The HDR Real Scene Peak Brightness was measured incorrectly and has been retested. The new value is in the same ballpark (385 nits rather than 395 nits). This small difference is likely due to the uniformity of the screen resulting in slightly different measurements.

7.2 Horizontal Viewing Angle
What it is: Color accuracy when viewed from the side.
LG 27UK650 Horizontal Color Shift Picture
Color Shift from Left
What it is: Angle where the colors noticeable shift compared to when viewed from directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When sharing your monitor with people on your left
Good value: > 50°
Noticeable difference: 10°
:
38 °
Color Shift from Right
What it is: Angle where the colors noticeable shift compared to when viewed from directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When sharing your monitor with people on your right
Good value: > 50°
Noticeable difference: 10°
:
39 °
LG 27UK650 Horizontal Brightness Picture
Brightness from Left
What it is: Angle where the brightness drops to 50% of the brightness directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When sharing your monitor with people on your left.
Good value: > 50°
Noticeable difference: 10°
:
44 °
Brightness from Right
What it is: Angle where the brightness drops to 50% of the brightness directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When sharing your monitor with people on your right.
Good value: > 50°
Noticeable difference: 10°
:
45 °
LG 27UK650 Horizontal Black Level Picture
Black Level from Left
What it is: Angle where the black level drops to 50% of the black level directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When sharing your monitor with people on your right.
Good value: > 50°
Noticeable difference: 10°
:
75 °
Black Level from Right
What it is: Angle where the black level drops to 50% of the black level directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When sharing your monitor with people on your right.
Good value: > 50°
Noticeable difference: 10°
:
75 °
Curve Radius : N/A

The horizontal viewing angles of the LG 27UK650-W are decent. Blacks remain black as you deviate from the center axis, but colors start shifting and brightness fades as the angle becomes larger. This is typical for IPS monitors and should cause no issues.

8.3 Vertical Viewing Angle
What it is: Color accuracy when viewed from the top or bottom.
LG 27UK650 Vertical Color Shift Picture
Color Shift from Below
What it is: Angle where the colors noticeable shift compared to when viewed from directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When looking at a monitor from below.
Good value: > 50°
Noticeable difference: 10°
:
27 °
Color Shift from Above
What it is: Angle where the colors noticeable shift compared to when viewed from directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When looking at a monitor when standing up.
Good value: > 50°
Noticeable difference: 10°
:
31 °
LG 27UK650 Vertical Brightness Picture
Brightness from Below
What it is: Angle where the brightness drops to 50% of the brightness directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When looking at a monitor from below.
Good value: > 50°
Noticeable difference: 10°
:
35 °
Brightness from Above
What it is: Angle where the brightness drops to 50% of the brightness directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When looking at a monitor while standing up.
Good value: > 50°
Noticeable difference: 10°
:
38 °
LG 27UK650 Vertical Black Level Picture
Black Level from Below
What it is: Angle where the black level drops to 50% of the black level directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When looking at a monitor from below.
Good value: > 50°
Noticeable difference: 10°
:
75 °
Black Level from Above
What it is: Angle where the black level drops to 50% of the black level directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When looking at a monitor while standing up.
Good value: > 50°
Noticeable difference: 10°
:
75 °

The vertical viewing angles of the LG 27UK650-W are great, very similar to rival Dell U2718Q. The angles at which the image starts to shift are large enough and most likely you will not have an issue with this.

8.7 Gray Uniformity
What it is: Evenness of colors onscreen (not just gray).
When it matters: Solid colors. Sports, panning shots.
Score components:
LG 27UK650 50% Uniformity Picture
50% Std. Dev.
What it is: Average squared difference of pixels when displaying a mid 50% gray.
When it matters: Solid colors. Sports, panning shots.
Good value: < 2.5%
Noticeable difference: 1%
:
3.070 %
50% DSE
What it is: Dirty Screen Effect. High-frequency variance of uniformity. Dark spots on the screen.
When it matters: Solid colors. Sports, panning shots.
Good value: < 0.165%
Noticeable difference: 0.025%
:
0.109 %
LG 27UK650 5% Uniformity Picture
5% Std. Dev.
What it is: Average squared difference of pixels when displaying a mid 5% gray.
When it matters: Dark scenes.
Good value: < 1.15%
Noticeable difference: 1%
:
0.352 %
5% DSE
What it is: Dirty Screen Effect. High-frequency variance of uniformity. Dark spots on the screen.
When it matters: Dark scenes.
Good value: < 0.116%
:
0.070 %

Excellent gray uniformity for the LG 27UK650. There is very little dirty screen effect and you should see no shades when browsing websites with large white areas. The edges of the screen, however, are noticeably darker than the rest.

6.0 Black Uniformity
What it is: Evenness of blacks.
When it matters: Dark scenes viewed in a dark room.
Score components:
LG 27UK650 Native Black Uniformity Picture
Native Std. Dev.
What it is: Average of the squared difference of the blacks.
When it matters: Dark scenes viewed in a dark room.
Good value: <2%
Noticeable difference: 1%, but keep in mind that it varies a lot by unit, even of the same model; yours likely will not end up exactly like ours.
:
2.002 %
Std. Dev. w/ L.D.
What it is: Average of the squared difference of the blacks with Local Dimming enabled
When it matters: Dark scenes viewed in a dark room.
Good value: <2%
Noticeable difference: 1%, but keep in mind that it varies a lot by unit, even of the same model; yours likely will not end up exactly like ours.
:
N/A

The overall black uniformity of this monitor is mediocre. There is a little clouding visible in most parts of the screen and only a small area of the screen is uniformly black.

8.1 Pre Calibration
What it is: Monitor's color accuracy before a full calibration. The measurements are taken with out of the box 'factory setting'.
When it matters: All video on an uncalibrated TV. This represents most people's use cases.
Score components:
LG 27UK650 Pre Calibration Picture LG 27UK650 Pre Gamma Curve Picture LG 27UK650 Pre Color Picture
Picture Mode
What it is: The picture mode that was used to do the pre-calibration reading. We usually go for the picture mode that gives us the more control over all the picture quality setting.
:
SMPTE-C
Luminance
What it is: The luminance at which the pre-calibration reading was done. This represents the luminance of the monitor when it is at the factory default settings.
:
227 cd/m²
Luminance Settings
What it is: The luminance settings, often named 'Brightness' on monitors, usually range from 0 to 100.
:
50
Contrast Setting
What it is: The monitor contrast setting, usually ranging from 0 to 100.
:
70
RGB controls
What it is: This is the value for each color (red, green, and blue) used in the monitor internal RGB cuts/gains controls. If the monitor does not have an internal RGB cuts/gains controls, then the color temperature setting will be used instead, and the color temperature that gives us the best result will be used.
:
N/A
Color Temperature
What it is: The color temperature is a measure of the color of light. A colder color temperature (7000K) will look bluer and a warmer color temperature (4000K) will look yellower/redder. 6500K is the standard color for PC monitors and also for the sRGB color standard.
When it matters: When you care about color reproduction and accuracy.
Good value: 6500K
Noticeable difference: 400K
:
6746 K
White Balance dE
What it is: Average inaccuracy of shades of gray.
When it matters: Overall color temperature of all video.
Good value: < 3
Noticeable difference: 1
:
2.17
Color dE
What it is: Average inaccuracy of colors.
When it matters: All colors.
Good value: < 3
Noticeable difference: 1
:
2.65
Gamma
What it is: Brightness of shades of gray.
When it matters: Shadows.
Good value: Between 2.1 and 2.3 (our target is 2.2)
Noticeable difference: 0.1
:
2.16

Great out of the box color accuracy of the LG 27UK650 monitor.

The 'SMPTE-C' Picture mode is the most accurate out of the box picture mode, but it disables most picture adjustment settings (with the exception of brightness). The color temperature is a little colder than our target of 6500 K, and there are minor color inaccuracies that most people, however, will not notice. The gamma is a bit below our sRGB target, but for out of the box settings this is still pretty good.

9.5 Post Calibration
What it is: Monitor's color accuracy after a full calibration with a spectrophotometer.
When it matters: All graphics and video content on a monitor that has been professionally calibrated.
Score components:
LG 27UK650 Post Calibration Picture LG 27UK650 Post Gamma Curve Picture LG 27UK650 Post Color Picture
Picture Mode
What it is: The picture mode that was used to do the calibration reading. We usually go for the picture mode that gives us the more control over all the picture quality setting.
:
Custom
Luminance
What it is: The luminance at which the calibration was executed. We aim for a luminance level of 100 cd/m².
:
102 cd/m²
Luminance Settings
What it is: The luminance settings, often named 'Brightness' on monitors, usually range from 0 to 100.
:
17
Contrast Setting
What it is: The monitor contrast setting, usually ranging from 0 to 100.
:
71
RGB controls
What it is: This is the value for each color (red, green, and blue) used in the monitor internal RGB cuts/gains controls. If the monitor does not have an internal RGB cuts/gains controls, then the color temperature setting will be used instead, and the color temperature that gives us the best result will be used.
:
46-50-48
Color Temperature
What it is: The color temperature is a measure of the color of light. A colder color temperature (7000K) will look bluer and a warmer color temperature (4000K) will look yellower/redder. 6500K is the standard color for PC monitors and also for the sRGB color standard.
When it matters: When you care about color reproduction and accuracy.
Good value: 6500K
Noticeable difference: 400K
:
6435 K
White Balance dE
What it is: Average inaccuracy of shades of gray.
When it matters: Overall color temperature of all videos.
Good value: < 3
Noticeable difference: 1
:
0.71
Color dE
What it is: Average inaccuracy of colors.
When it matters: All colors.
Good value: < 3
Noticeable difference: 1
:
0.68
Gamma
What it is: Brightness of shades of gray.
When it matters: Shadows.
Good value: Between 2.1 and 2.3 (our target is 2.2)
Noticeable difference: 0.1
:
2.18

After calibration the color accuracy of the LG 27UK650 is excellent. We set the Picture mode to 'Custom' as it is in this mode that we have the full control on the internal RGB cuts/gains controls. The color temperature is much closer to our desired 6500 K, and both the color dE and the white balance dE are well under what anyone could notice. The gamma is slightly closer to our sRGB target.

You can download our ICC profile calibration here. This is provided for reference only and should not be used, as the calibration values vary per individual unit even for the same model due to manufacturing tolerances.

8.7 SDR Color Gamut
What it is: The palette of colors the monitor can display
When it matters: General content consumption or production
Score components:
LG 27UK650 Color Gamut s.RGB Picture
s.RGB xy
What it is: Coverage of the s.RGB colorspace on CIE 1931 xy.
When it matters: Almost all content. Includes websites, standard windows environment and SDR movies
Good value: > 95%
Noticeable difference: 5%
:
98.5 %
LG 27UK650 Color Gamut ARGB Picture
Adobe RGB xy
What it is: Coverage of the Adobe RGB colorspace on CIE 1931 xy.
When it matters: Professional photography.
Good value: > 90%
Noticeable difference: 5%
:
76.4 %

s.RGB Picture Mode: Custom (calibrated)
Adobe RGB Picture Mode: Photo

The color gamut of the LG 27UK650 is great as it covers most of the common sRGB colorspace. On the other hand, professionals in the publishing business might find the coverage of the Adobe RGB colorspace limited for their standards.

Update 08/22/2018: The sRGB gamut was incorrectly listed as 91.8%. This has now been fixed.

9.0 SDR Color Volume
What it is: How much of the SDR color spaces the monitor can reproduce
When it matters: General usage and SDR media creation
Score components:
LG 27UK650 s.RGB Color Volume ITP picture
s.RGB in ICtCp
What it is: How much of the s.RGB colorspace a monitor can display at different luminosity levels
When it matters: Most content, including web, SDR video games, and SDR media creation
:
98.9 %
LG 27UK650 Adobe RGB Color Volume ITP Picture
Adobe RGB in ICtCp
What it is: How much of the Adobe RGB colorspace a monitor can display at different luminosity levels, normalized to the monitor's peak brightness.
When it matters: Professional media creation
:
81.2 %

s.RGB Picture Mode: Custom
Adobe RGB Picture Mode: Photo

Excellent SDR color volume. It covers almost all of the s.RGB color volume. Its coverage of Adobe RGB is very good too although the low contrast ratio does not allow it to cover the darker shades. This might be an issue with those who want to use this monitor for professional photo editing which benefits from being able to display colors across the entire brightness range.

6.8 HDR Color Gamut
What it is: The monitor's ability to reproduce HDR color spaces
When it matters: HDR content consumption or media creation
Score components:
Wide Color Gamut
What it is: Whether the monitor can support wider color gamuts
When it matters: HDR content and media creation
:
No
LG 27UK650 Color Gamut DCI-P3 Picture
DCI P3 xy
What it is: Coverage of the DCI P3 colorspace on CIE 1931 xy
When it matters: When consuming or producing HDR content.
:
78.8 %
LG 27UK650 Color Gamut Rec.2020 Picture
Rec. 2020 xy
What it is: Coverage of the Rec.2020 colorspace on CIE 1931 xy.
When it matters: When consuming or producing HDR content.
Good value: > 90%
Noticeable difference: 5%
:
57.5 %

DCI P3 Picture Mode: HDR Standard
Rec. 2020 Picture Mode: HDR Standard

Decent HDR color gamut for this LG 27UK650-W monitor. The coverage of the DCI P3 xy is good but the monitor fails to achieve a Rec. 2020 xy color space coverage above our threshold of 67% to be classified as having a wide color gamut.

5.9 HDR Color Volume
What it is: How much of the HDR color spaces a monitor can display at different luminosity levels.
When it matters: HDR content consumption and production. Includes streaming services, UHD Blu-rays and HDR games.
Score components:
LG 27UK650 P3 Color Volume ITP Picture
DCI-P3 in ICtCp
What it is: How much of the DCI-P3 colorspace a monitor can display at different luminosity levels, normalized to the monitor's peak brightness output.
When it matters: HDR content.
Good value: 80%
Noticeable difference: 5%
:
68.4 %
LG 27UK650 2020 Color Volume ITP Picture
Rec. 2020 in ICtCp
What it is: How much of the Rec. 2020 colorspace a monitor can display at different luminosity levels, normalized to the monitor's peak brightness output.
When it matters: HDR content.
Good value: 80 %
Noticeable difference: 5 %
:
49.1 %

DCI P3 Picture Mode: HDR Standard
Rec. 2020 Picture Mode: HDR Standard

Disappointing HDR color volume. The monitor cannot display a wide range of colors mostly due to the lack of a wide color gamut and it is also limited by the contrast.

7.6 Image Retention
What it is: How much a static image is retained on a monitor screen after a certain amount of time.
When it matters: When working or playing video games on your PC monitor.
LG 27UK650 Image Retention Picture
IR after 0 min recovery
What it is: Image retention measured right after the static image exposure, without recovery time.
When it matters: When changing use or right after changing the type of on screen content (i.e. stopping playing video game to watch a movie).
Good value: 0 is perfect.
Noticeable difference: 0.015%
:
0.26 %
IR after 2 min recovery
What it is: Image retention measured after a recovery time of 2 minutes.
When it matters: When changing use or right after changing the type of on screen content (i.e. stopping playing video game to watch a movie).
Good value: 0 is perfect
Noticeable difference: 0.015%
:
0.00 %
IR after 4 min recovery
What it is: Image retention measured after a recovery time of 4 minutes.
When it matters: When changing use or right after changing the type of on screen content (i.e. stopping playing video game to watch a movie).
Good value: 0 is perfect.
Noticeable difference: 0.015%
:
0.00 %
IR after 6 min recovery
What it is: Image retention measured after a recovery time of 6 minutes.
When it matters: When changing use or right after changing the type of on screen content (i.e. stopping playing video game to watch a movie).
Good value: 0 is perfect.
Noticeable difference: 0.015%
:
0.00 %
IR after 8 min recovery
What it is: Image retention measured after a recovery time of 8 minutes.
When it matters: When changing use or right after changing the type of on screen content (i.e. stopping playing video game to watch a movie).
Good value: 0 is perfect.
Noticeable difference: 0.015%
:
0.00 %
IR after 10 min recovery
What it is: Image retention measured after a recovery time of 10 minutes.
When it matters: When changing use or right after changing the type of on screen content (i.e. stopping playing video game to watch a movie).
Good value: 0 is perfect.
Noticeable difference: 0.015%
:
0.00 %

The LG 27UK650 has a good image retention performance. However, some slight signs of image retention are present immediately after the exposure of our test image. This is unlikely to be noticeable in most content.

9.9 Gradient
What it is: How finely levels of color can be displayed.
When it matters: Details in shadows, sky and skin tones. Matters more for HDR content.
Score components: Subjectively assigned
LG 27UK650 Gradient Picture
Color Depth
What it is: Number of bits per pixel to represent a specific color. Note: we consider 8-bit with dithering to be equivalent to 10-bit, as long as the 10-bit gradient looks smooth.
When it matters: HDR content like HDR video games or HDR UHD movies. Won't matter for regular Blu-ray movies, SDR video game or desktop environment content displayed from a Windows PC. Those are limited to 8-bit color.
Good value: 10-bit.
Noticeable difference: 1 bit.
:
10 Bit

The LG 27UK650-W has excellent performance when displaying our gradient test image. Some banding is visible, but nothing important. The minor banding is visible in the darker shades of gray and green, but it will not be an issue with normal content.

10 Color Bleed
What it is: How much the color from one area of the screen affects the color in another area of the screen.
When it matters: All usages, but especially media creation.
Score components:
LG 27UK650 Color bleed horizontal
Pixel row error
What it is: The amount of bleed that appears across the screen horizontally.
When it matters: General usage of a PC monitor, can appear when browsing the web or with media creation like graphics.
Good value: <0.2%
Noticeable difference: 0.1%
:
0.000 %
LG 27UK650 Color bleed vertical
Pixel column error
What it is: Amount of color bleeding that appears across the screen vertically.
When it matters: Most uses of a PC monitor. Can appear while browsing the web or when editing images or graphics.
Good value: <0.2%
Noticeable difference: 0.1%
:
0.000 %

When displaying large bands of a single color no issues can be seen with the color bleed performance.

7.5 Reflections
What it is: How much light is reflected by the TV.
When it matters: Bright rooms.
Score components: Subjectively assigned
LG 27UK650 Average room LG 27UK650 Average room off picture LG 27UK650 Bright room off picture

The reflection handling is good. The semi-gloss finish diffuses reflections across the screen, reducing their intensity. This is good for most environments, but it may be a problem in a bright room, as the entire screen glares.

8.0

Motion

Score components:

Motion looks good on the LG 27UK650. It is not as good, however, as other gaming monitors. The monitor has a fast response time and a flicker-free backlight. There is no option to enable flicker to clear up blur and this might disappoint some gamers. It supports FreeSync variable refresh rate technology, however, the 60 Hz refresh rate might not be enough for extreme gamers.

8.8 Motion Blur
What it is: The performance of the pixel response time. Poor response time causes trails to follow moving objects. Response time is one of a few sources of motion blur.
When it matters: When there's fast movement on screen, such as during video games and sports.
Score components:
LG 27UK650 Motion Blur Picture LG 27UK650 Response Time Chart
80% Response Time
What it is: How quickly pixels can reach 80% of a full transition from one color to another.
When it matters: When there's fast movement on screen, such as during video games and sports.
Good value: < 8 ms
Noticeable difference: 4 ms
:
5.0 ms
100% Response Time
What it is: How quickly pixels can fully transition from one color to another.
When it matters: When there's fast movement on screen, such as during video games and sports.
Good value: < 20 ms
Noticeable difference: 10 ms
:
12.1 ms
Best Overdrive Setting
What it is: If the monitor has adjustable pixel overdrive settings, which one produces the best response time with minimal overshoot.
When it matters: When adjusting the monitor's settings to get the least possible motion blur.
:
Normal

Response Time Off
Response Time Normal
Response Time Fast
Response Time Faster

The response time is excellent. This results in an image with only a short trail visible as shown by the photo above. The 'Normal' Response Time setting was the most balanced. The 'Fast' setting was very similar as it reduced slightly the 80% response time, but it added some slight overshoot and thus the 100% response time was longer. We recommend using the 'Normal' overdrive setting for the best viewing experience.

7.5 Image Flicker
What it is: Luminosity pattern when displaying images
When it matters: Nearly all the time during PC monitor use, but especially during fast movement such as video games
LG 27UK650 Backlight Picture
Flicker-free : Yes
PWM Dimming Frequency
What it is: Flickering pattern at different luminosities.
When it matters: For people sensitive to flickering.
Good value: N/A or high frequencies (> 300 Hz). Frequencies that are multiples of 60Hz are better.
:
0 Hz
Black Frame Insertion (BFI)
What it is: Option to turn screen black between frames
When it matters: Reduces eye tracking blur in motion
Good value: Yes
:
No
BFI Maximum Frequency
What it is: Highest possible frequency of flickering pattern
When it matters: Reduces eye-tracking blur in motion
Good value: Matches the native refresh rate
Noticeable difference: 20 Hz
:
N/A
BFI Minimum Frequency
What it is: Lowest possible frequency of flickering pattern
When it matters: Reduces eye-tracking blur in motion
Good value: 60 Hz
Noticeable difference: 20 Hz
:
N/A

This monitor's backlight does not flicker and this is great. On the other hand, the inability to introduce flicker does not allow the monitor to clear blur.

We did notice some unusual behavior of this monitor. After testing the input lag on the LG 27UK650, we noticed some significant panel flicker where our test patterns were situated (see our test here). This flicker ghosting persisted for about 15 minutes after our test (which displays flickering rectangles for less than a minute) was done, but the issue went away more quickly when the monitor was displaying moving content as opposed to static content. You can see the flicker when displaying a 50% gray image here filmed with a high-speed camera.

In very extreme cases this can be a problem for those who watch content or play games that include a lot of fast-changing brightness levels or strobing lights. We do not know if this flicker retention is caused by a defect in our unit, or if it is a built-in issue.

It is, however, only temporary and it is highly unlikely that most people will experience this during normal usage.

7.8 Refresh Rate
What it is: How frequently the monitor can refresh and show new frames, and whether it can vary its refresh rate in real time using technologies like G-sync and FreeSync.
When it matters: Mostly for gaming, but does provide a little better motion during normal usage.
Native
What it is: The frequency at which the monitor is capable of displaying images every second
When it matters: General usage, but better results are most important for gaming
Good value: >100 Hz
Noticeable difference: 15 Hz
:
60 Hz
Factory Overclock
What it is: The frequency at which the monitor's can be boosted to using its internal menu.
When it matters: Gaming and other usages where high frame rate content is consumed.
Good value: >100
Noticeable difference: 15
:
N/A
Variable Refresh Rate
What it is: Feature that allows the monitor to synchronize its refresh rate with the input device's output and reduces stuttering and screen tearing.
When it matters: Almost every usage, but is most noticeable in gaming where constant fluctuation in framerate cause distracting artifacts.
:
FreeSync
VRR Maximum
What it is: The maximum frequency covered by the Variable Refresh Rate feature of the monitor.
When it matters: Any time the VRR feature is enabled.
Good value: Matches Refresh rate
Noticeable difference: 10 Hz
:
60 Hz
VRR Minimum
What it is: The lowest frequency covered by the monitor's Variable Refresh Rate feature.
When it matters: When using the VRR feature of the monitor at lower frame rates.
Good value: 30 Hz
:
40 Hz
VRR Maximum With OC
What it is: The maximum frequency covered by the Variable Refresh Rate feature when the monitor's overclocking feature is used.
When it matters: When both the overclocking and VRR features are used.
Good value: Matching the overclocked refresh rate.
Noticeable difference: 10 hz
:
N/A
VRR Supported Connectors : DisplayPort, HDMI

The refresh rate of the LG 27UK650 is good but not as good as higher end models like the Samsung CHG70. The monitor has the Freesync implementation of the VRR technology but can only lower its rate to 40Hz which might not be enough for some games that will put a real strain on your graphics card.

The HDMI Ultra HD Deep Color setting must be enabled to display 4K at the native 60Hz refresh rate over HDMI.

9.0

Inputs

Score components:

Excellent input performance of the LG 27UK650-W. It has a very low input lag and an excellent 4K UHD resolution that will display every little detail on its large screen and this is great news not only for gamers but also those who need a large space where they can open multiple windows to work on.

8.9 Input Lag
What it is: Delay between input and onscreen reaction.
When it matters: General usage of the mouse and gaming.
Native Resolution
What it is: Lowest input lag possible at the center of the screen, when the monitor is displaying its native resolution at its native refresh rate.
When it matters: General usage and while playing video games.
Good value: < 15 ms
Noticeable difference: 5 ms
:
8.8 ms
Non-Native Resolution
What it is:

Lowest input lag possible at the center of the screen, when the monitor is displaying an alternative resolution at its native refresh rate. The non-native resolution tested depends on the native resolution of the monitor, following this pattern unless otherwise specified in the Input Lag text:

Native Resolution Non-Native Resolution Tested
4k UHD QHD
QHD FHD
FHD 1600x900
3440x1440 2560x1080
2560x1080 1920x1080
When it matters: General usage as well as gaming.
Good value: < 15 ms
Noticeable difference: 5 ms
:
9.0 ms
Native Resolution @ 60 Hz
What it is: Lowest input lag possible at the center of the screen, when the monitor is displaying its native resolution at a refresh rate of 60 Hz.
When it matters: General usage as well as gaming.
Good value: < 15 ms
Noticeable difference: 5 ms
:
8.8 ms
Variable Refresh Rate
What it is: Lowest input lag possible at the center of the screen, when the monitor is using its Variable Refresh Rate feature at its native resolution.
When it matters: General usage as well as gaming.
Good value: < 15 ms
Noticeable difference: 5 ms
:
9.2 ms
HDR
What it is: Lowest input lag possible at the center of the screen, when the monitor is displaying an HDR signal at its native resolution and refresh rate.
When it matters: General usage as well as gaming.
Good value: < 15 ms
Noticeable difference: 5 ms
:
8.9 ms
Black Frame Insertion (BFI)
What it is: Lowest input lag possible at the center of the screen, when BFI is enabled and the monitor is displaying a signal at the highest supported BFI refresh rate.
When it matters: General usage as well as gaming.
Good value: < 15 ms
Noticeable difference: 5 ms
:
N/A

HDR input lag was measured using the HDMI port and not DisplayPort like the other measurements.

Non-Native Resolution tested: 1080p

Great low input lag on the LG 27UK650, particularly for a 60Hz monitor. The FreeSync input lag is roughly the same as the native refresh rate input lag, which is great.

9.1 Resolution and Size
What it is: The number of pixels the monitor can display, and the surface area of its screen.
When it matters: All usages, but especially for office and media editing.
Score components:
Native Resolution : 4K UHD, 3840 x 2160
Aspect Ratio : 16:9
Megapixels : 8.3 MP
Pixel Density : 164 PPI
Screen Diagonal : 26.9 inches
Screen Area : 310 sq inches

The LG 27UK650-W has a very high 4K resolution and a large 27" size, which gives it incredible pixel density and detail while having plenty of screen space to work on.

Inputs
LG 27UK650 Inputs 1

All the inputs are located on the back of the monitor facing outwards.

Total Inputs
DisplayPort : 1 (DP 1.2)
Mini DisplayPort : No
HDMI : 2 (HDMI 2.0)
DVI : No
VGA : No
DisplayPort Out : No
USB : No
USB C : No
Analog Audio Out 3.5mm : 1
Microphone In 3.5mm : No
Digital Optical Audio Out : No
Analog Audio Out RCA : No

Even though HDR support started with DP 1.4, HDR works over this monitor's DP 1.2 port (the DisplayPort 1.2 toggle doesn't seem to do anything).

To allow full HDMI 2.0 bandwidth, the HDMI Ultra HD Deep Color option must be enabled for the corresponding HDMI port.

Features

The LG 27UK650 has the standard features of a monitor, as well as some situational features like 'Super Resolution+', 'Black Stabilizer' and 'Automatic Standby', and it supports HDR10.

Additional Features
What it is: Additional features found on the monitor
Score components:
Speakers
What it is: Whether or not the monitor features standalone speakers.
When it matters: When using your computer without headphones or a dedicated pair of speakers.
:
No
HDR10 : Yes

The LG 27UK650 has the same additional features found on other LG monitors:

  • Super Resolution+: an upscaling function that tries to extract more info from the signal so as to sharpen / clear up upscaled video
  • Black Stabilizer: an option to affect the gamma of dark shades while not affecting light shades.
  • Automatic Standby: a feature to turn the monitor off automatically after extended periods of no movement on the screen.

This monitor also supports HDR10.

On-Screen Display (OSD)
LG 27UK650 OSD picture

The on-screen display of the LG 27UK650-W is intuitive, well-organized and easy to use.

Controls
LG 27UK650 Controls picture

The on-screen display is controlled by a small joystick nub under the center of the monitor. This is better than the usual four button scheme found on most monitors and it makes navigating the OSD much more intuitive. This joystick nub can be found on many other LG monitors like the 43UD79-B as well as on some Samsung monitors like the CHG70.

In The Box
LG 27UK650 In The Box picture

  • Manual and drivers
  • Power cable
  • HDMI cable
  • DisplayPort cable

Differences between Sizes and Variants

We tested the white variant of the 27" model (27UK650-W). The model we reviewed was manufactured in April 2018.

If someone comes across a different type of panel or if their 27UK650 doesn't correspond to our review, let us know and we will update the review. Note that some tests such as the gray uniformity may vary between individual units.

Model Size Refresh rate Notes
24UD58-B 24" 60Hz  
27UD58-B 27" 60Hz  
27UD68P-B 27" 60Hz Black variant
27UD68P-W 27" 60Hz White variant
27UK650-W 27" 60Hz White variant

Compared to other Monitors

LG 27UK650 Group Shot Picture
Left: Samsung CHG70. Middle: LG 27UK650. Right: Acer Predator X27.
Unlike our other photographs, this picture wasn't taken under a controlled environment, so do not draw conclusions from it.

The LG 27UK650 is a 4K monitor with an IPS screen and FreeSync support, and one of the best 4k monitors we've tested in 2018.

Dell U2718Q

The Dell U2718Q and the LG 27UK650 both have very similar performance. They are both very good monitors for gaming. The Dell U2718Q has slightly better ergonomics which makes it easier to place the monitor comfortably while gaming, whereas the LG 27UK650 has marginally better refresh rate since it includes the Freesync implementation of the variable refresh rate to eliminate tearing and is also flicker-free. 

LG 27UD58-B

The LG 27UK650 is much better than the LG 27UD58-B. The LG 27UK650 has better ergonomics making it easier to place it comfortably. The LG 27UK650 has marginally better vertical viewing angles and marginally better SDR peak brightness which are important for office use. Finally, the LG 27UK650 supports HDR content and has better black uniformity, which make it a better choice for multimedia watching. 

Samsung CHG70

If you've got a bright office and work closely with others, the LG 27U650 is a better choice, but if you play games in a dark room sitting directly in front, then the Samsung CHG70 is a better choice. The LG 27UK650 has better resolution and much better vertical and horizontal viewing angle which make better for office use. On the other hand, the Samsung CHG70 has better refresh rate and input lag and which make it better for gaming. The Samsung CHG70 also has better blacks due to better contrast and local dimming support and better HDR performance. 

LG 27UD68P-B

The LG 27UK650 is better than the LG 27UD68P-B. The LG 27UK650 supports HDR, although it doesn't benefit much from it. The LG 27UK650 also has a faster pixel response time, resulting in a smaller blur trail when you play fast action games. In most other areas the two monitors offer similar performance.

Dell U2717D

The LG 27UK650 is significantly better than the Dell U2717D. The LG 27UK650 has a much lower input lag and supports FreeSync VRR which is great if you play games. The LG supports HDR content and has a higher native resolution that allows you to see more detail on your screen. The Dell U2717D, on the other hand, has better ergonomics and you can easily position it to your liking.

Dell U2515H

The LG 27UK650 is better than the Dell U2515H. The Dell U2515H has better ergonomics that easily allow you to place it comfortably. On the other hand, the LG 27UK650 has slightly better refresh rate, better resolution and size and marginally better vertical viewing angle that make it more suitable for almost every usage. Finally, the LG 27UK650 offers HDR support, albeit not great. 

+ Show more

Conclusion
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7.9Mixed Usage
Score components:
  • 30% Office
  • 30% Multimedia
  • 25% Gaming
  • 10% Media Creation
  • 5% HDR Gaming
The LG 27UK650 is a very good monitor and will please you with most usages. It has wide viewing angles and you can adjust it to a good viewing position. The large viewing area and high-resolution screen give you more space to work on and allow you to see the small details in games. The monitor has decent HDR support but this should not be the reason to choose it.
This is a very good monitor for office usage. The ergonomics are decent and you should be able to position it comfortably. It has a large screen with excellent resolution that gives you enough space to work on, and good viewing angles that allow you to share your work with colleagues seating next to you. The picture quality is good and the reflection handling makes it suitable for the average office environment.
Very good monitor for gaming. It has an excellent low input lag and a fast response time and feels very responsive. It comes equipped with the Freesync implementation of the variable refresh rate that lowers the input lag with compatible game cards, but it does not include any flickering features to clear blur. The resolution and size will definitely keep you happy as you will be able to see every small detail.
The LG 27UK650-W is a very good monitor for multimedia usage. Its high resolution and large size give you more than enough screen space and will display every small detail. It has very good brightness levels so you can enjoy streaming in brighter rooms, but you should avoid very dark rooms as the mediocre contrast makes blacks appear gray. Finally, it has decent viewing angles, which are good if multiple people are watching.
This is a very good monitor for media creation. The large screen and high resolution make it easy to see more at once. It has very accurate and vivid colors, but the Adobe color space coverage is limited, and this might affect those who want to use it for photo editing.
This is a decent monitor for HDR gaming. It has a very low input lag and only a small blur trails the image. Unfortunately, the contrast ratio makes blacks look gray in darker environments where HDR gaming is meant to be played. The refresh rate is only 60Hz and this might disappoint some hardcore gamers, but on the other hand, it supports Freesync to eliminate tearing. Due to the lack of wide color gamut and low peak brightness, HDR gaming experience is not too great.

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