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LG 27UK650-W Monitor Review

Tested using Methodology v1.1
Updated Apr 17, 2020 at 03:04 pm
LG 27UK650-W Picture
7.9
Mixed Usage
8.1
Office
7.8
Gaming
7.9
Multimedia
8.1
Media Creation
6.8
HDR Gaming
Size 27"
Resolution 3840x2160
Max Refresh Rate
60 Hz
Pixel Type
IPS
Variable Refresh Rate
FreeSync

The LG 27UK650-W is a very good 27 inch, 4k IPS monitor with a low input lag for gaming and great SDR peak brightness. It has very good color accuracy, wide viewing angles, and a great resolution that will display every little detail. Although the monitor supports HDR, it doesn't add much as it can't display a wide color gamut. It's more suitable for average-lit environments where it can handle glare well, and in dark rooms, blacks appear gray.

Our Verdict

7.9 Mixed Usage

The LG 27UK650-W is a good monitor and will please you in most usages. It has wide viewing angles and the large screen gives you more space to work on. Also, the high resolution allows you to see small details. The monitor has HDR support but it fails to display a wide color gamut.

Pros
  • Excellent resolution and size allow for multitasking.
  • Input lag is very low.
  • Wide viewing angles.
Cons
  • Lacking HDR performance.
  • No local dimming support.
8.1 Office

The 27UK650-W is a very good monitor for office use. The 27 inch screen offers plenty of space for multitasking, and the 4k resolution allows you to see images clearly. It has great viewing angles, so the image will appear accurate when viewed from the side. Unfortunately, it has disappointing ergonomics, and you'll need to move the entire monitor if you want to adjust your screen to the side.

7.8 Gaming

Good monitor for gaming. The 27UK650-W has an excellent low input lag and a fast response time. It comes equipped with FreeSync variable refresh rate technology to help reduce tearing in games, but it doesn't include a black frame insertion feature to reduce motion blur.

7.9 Multimedia

The LG 27UK650-W is a good monitor for multimedia usage. Its high resolution and large size give you more than enough screen space and will display small details. It can get very bright 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 great viewing angles, which are good if multiple people are watching.

8.1 Media Creation

This is a very good monitor for media creation. The large screen and high resolution make it easy to open multiple windows. It has very accurate and vivid colors, but the Adobe RGB color space coverage is limited, and this might affect those who want to use it for photo editing.

6.8 HDR Gaming

Decent monitor for HDR gaming. The 27UK650-W can't display a wide color gamut and fails to bring out highlights. On the upside, it has a very low input lag and fast-moving images look clear. Unfortunately, the contrast ratio makes blacks look gray and the 60Hz refresh rate might disappoint some hardcore gamers.

  • 7.9 Mixed Usage
  • 8.1 Office
  • 7.8 Gaming
  • 7.9 Multimedia
  • 8.1 Media Creation
  • 6.8 HDR Gaming
  1. Update 2/17/2020: Converted to Test Bench 1.1.
  2. Update 1/17/2019: We tested the monitor's compatibility with NVIDIA's new FreeSync driver. See our full investigation into NVIDIA's FreeSync Drivers here.

Test Results

Design
Design
Style
Curved No
Curve Radius Not Curved
Weight (without stand)
9.9 lbs (4.5 kg)
Weight (with stand)
13.4 lbs (6.1 kg)

The 27UK650-W has a modern style with a white back and a very wide stand. It fits right into any office environment.

Design
Stand
Width
17.9" (45.5 cm)
Depth
9.1" (23.1 cm)

The stand is plastic and curved. It looks stylish and supports the monitor well, but will wobble a little if you knock it. It has a wide footprint so you can place things in front of it.

5.9
Design
Ergonomics
Height Adjustment
4.3" (10.9 cm)
Switch Portrait/Landscape Yes, Clockwise
Swivel Range N/A
Tilt Range -17.5° to 2.5°

Disappointing ergonomics. You can adjust its tilt, but since it can't swivel, you'll need to move the whole monitor. However, you can place it in portrait mode, but it only rotates clockwise, so that means the inputs will be on top, which isn't ideal if you have short wires for whatever you need to insert into the monitor.

If you need a monitor that has better ergonomics, take a look at the Dell UltraSharp U2720Q.

Design
Back
Wall Mount VESA 100x100

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

Design
Borders
Borders
0.3" (0.8 cm)

The borders are very thin and elegant.

Design
Thickness
Thickness (with stand)
5.6" (14.2 cm)
Thickness (without stand)
1.7" (4.3 cm)

The monitor has an average thickness when it's on its stand. If you choose to VESA mount it, then it will look significantly thinner and won't protrude.

6.5
Design
Build Quality

Note 01/07/2020: We've seen a few reports of increasing light bleed from the corners over time. Some people have seen this start even 1-2 years after receiving their unit. We haven't noticed this on ours.

The build quality is decent. There are no gaps and you shouldn't have any issues with this monitor. On the other hand, it's plastic and doesn't have a premium construction feel to it.

Picture Quality
6.3
Picture Quality
Contrast
Native Contrast
1196 : 1
Contrast With Local Dimming
N/A

The contrast ratio is mediocre, as is the case with most IPS monitors. In darker rooms, blacks will appear gray. If you want a 4k monitor with better dark room performance, check out the Dell S3221QS.

0
Picture Quality
Local Dimming
Local Dimming
No
Backlight
Direct

The LG 27UK650-W doesn't have a local dimming feature. The video above is for reference only.

8.0
Picture Quality
SDR Peak Brightness
SDR Real Scene
352 cd/m²
SDR Peak 2% Window
351 cd/m²
SDR Peak 10% Window
352 cd/m²
SDR Peak 25% Window
352 cd/m²
SDR Peak 50% Window
352 cd/m²
SDR Peak 100% Window
350 cd/m²
SDR Sustained 2% Window
350 cd/m²
SDR Sustained 10% Window
351 cd/m²
SDR Sustained 25% Window
351 cd/m²
SDR Sustained 50% Window
351 cd/m²
SDR Sustained 100% Window
350 cd/m²
SDR ABL
0.000

Great SDR peak brightness. The brightness is consistent across varied content and it can get bright enough to combat glare in most rooms.

6.6
Picture Quality
HDR Peak Brightness
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

Okay HDR peak brightness. It doesn't get bright enough to bring out highlights, but it remains fairly consistent across different content.

8.1
Picture Quality
Horizontal Viewing Angle
Color Washout From Left
43 °
Color Washout From Right
42 °
Color Shift From Left
58 °
Color Shift From Right
60 °
Brightness Loss From Left
48 °
Brightness Loss From Right
48 °
Black Level Raise From Left
70 °
Black Level Raise From Right
70 °
Gamma Shift From Left
42 °
Gamma Shift From Right
41 °

The horizontal viewing angles of the LG 27UK650-W are great. This is typical for IPS monitors, which is ideal for sharing your screen with others.

7.6
Picture Quality
Vertical Viewing Angle
Color Washout From Below
34 °
Color Washout From Above
36 °
Color Shift From Below
49 °
Color Shift From Above
49 °
Brightness Loss From Below
34 °
Brightness Loss From Above
36 °
Black Level Raise From Below
70 °
Black Level Raise From Above
70 °
Gamma Shift From Below
44 °
Gamma Shift From Above
55 °

The vertical viewing angles of the LG 27UK650-W are good, very similar to Dell U2718Q. The edges of the screen might appear slightly darker if you sit close to the screen, but this shouldn't be a problem for most people.

8.7
Picture Quality
Gray Uniformity
50% Std. Dev.
3.070 %
50% DSE
0.109 %
5% Std. Dev.
0.352 %
5% DSE
0.070 %

Excellent gray uniformity for the LG 27UK650. There's very little dirty screen effect and you shouldn't notice any darkening when browsing websites with large white areas. The edges of the screen, however, are noticeably darker than the rest.

6.0
Picture Quality
Black Uniformity
Native Std. Dev.
2.002 %
Std. Dev. w/ L.D.
N/A

Note 01/07/2020: We've seen a few reports of increasing light bleed from the corners over time. Some people have seen this start even 1-2 years after receiving their unit. We haven't noticed this on ours.

The overall black uniformity of this monitor is mediocre. There's visible clouding across the screen.

8.1
Picture Quality
Pre Calibration
Picture Mode
SMPTE-C
Luminance
227 cd/m²
Luminance Settings
50
Contrast Setting
70
RGB Controls
N/A
Gamma Setting
No Gamma Setting
Color Temperature
6746 K
White Balance dE
2.17
Color dE
2.65
Gamma
2.16

The 27UK650-W has very good out-of-the-box color accuracy. Most colors are fairly accurate, although the color temperature is colder than our target of 6500K, so colors may have a blue tint to them. The gamma curve follows the target well, but dark scenes will appear darker than they should, and bright scenes will be brighter.

9.5
Picture Quality
Post Calibration
Picture Mode
Custom
Luminance
102 cd/m²
Luminance Settings
17
Contrast Setting
71
RGB Controls
46-50-48
Gamma Setting
Mode 4
Color Temperature
6435 K
White Balance dE
0.71
Color dE
0.68
Gamma
2.18

Outstanding post-calibration color accuracy. There are minimal inaccuracies in most colors and the color temperature is much closer to the target. The gamma curve follows the target almost perfectly, although some scenes may appear brighter than they should.

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
Picture Quality
SDR Color Gamut
sRGB xy
98.5 %
Adobe RGB xy
76.4 %
sRGB Picture Mode
Custom
Adobe RGB Picture Mode
Photo

The color gamut of the LG 27UK650-W is excellent as it covers almost all of the common sRGB colorspace. On the other hand, photo editors might find the coverage of the Adobe RGB color space limiting for their standards.

9.0
Picture Quality
SDR Color Volume
sRGB In ICtCp
98.9 %
Adobe RGB In ICtCp
81.2 %
sRGB Picture Mode
Custom
Adobe RGB Picture Mode
Photo

Excellent SDR color volume. It can display a wide range of shades, although it can't display darker shades due to the low contrast ratio. This might be an issue with those who want to use it for photo editing and need it to display colors across the entire brightness range.

6.8
Picture Quality
HDR Color Gamut
Wide Color Gamut
No
DCI P3 xy
78.8 %
Rec. 2020 xy
57.5 %
DCI P3 Picture Mode
HDR Standard
Rec. 2020 Picture Mode
HDR Standard

The 27UK650-W fails to display a wide color gamut in HDR. It has good coverage of the DCI P3 color space used in most content, but it can't produce most colors in the wider Rec.2020 color space. If you want a similar monitor that can display a wide color gamut, check out the Dell S2721QS.

5.9
Picture Quality
HDR Color Volume
DCI-P3 In ICtCp
68.4 %
Rec. 2020 In ICtCp
49.1 %
DCI P3 Picture Mode
HDR Standard
Rec. 2020 Picture Mode
HDR Standard

Disappointing HDR color volume. The monitor can't display a wide range of colors mostly due to the lack of a wide color gamut and a low contrast ratio.

9.3
Picture Quality
Image Retention
IR After 0 Min Recovery
0.26 %
IR After 2 Min Recovery
0.00 %
IR After 4 Min Recovery
0.00 %
IR After 6 Min Recovery
0.00 %
IR After 8 Min Recovery
0.00 %
IR After 10 Min Recovery
0.00 %

Outstanding 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
Picture Quality
Gradient
Color Depth
10 Bit

The LG 27UK650-W has an excellent gradient performance, and banding isn't visible.

10
Picture Quality
Color Bleed
Pixel Row Error
0.000 %
Pixel Column Error
0.000 %

There's no visible sign of color bleed on the 27UK650-W.

7.3
Picture Quality
Reflections
Screen Finish
Matte
Total Reflections
5.6 %
Indirect Reflections
3.0 %
Calculated Direct Reflections
2.6 %

The reflection handling is decent. The semi-gloss finish diffuses reflections across the screen, but it may be a problem in a bright room, as the entire screen glares.

9.5
Picture Quality
Text Clarity
Sub-Pixel Layout
RGB

The 4k resolution on this monitor produces clear text. Enabling ClearType (top photo) can make text easier to read.

Motion
8.2
Motion
Response Time @ Max Refresh Rate
Best Overdrive Setting
Normal
Rise / Fall Time
6.8 ms
Total Response Time
13.5 ms
Overshoot Error
1.3 %
Dark Rise / Fall Time
7.4 ms
Dark Total Response Time
14.7 ms
Dark Overshoot Error
2.8 %

Overdrive Setting Response Time Chart Response Time Tables Motion Blur Photo
Off Chart Table Photo
Normal Chart Table Photo
Fast Chart Table Photo
Faster Chart Table Photo

Very good response time on the 27UK650-W. Motion looks the most clear with the Response Time set to 'Normal.' There's a bit of overshoot in some darker transitions in this setting, but there's less overshoot than on the other settings, and it looks the clearest.

8.2
Motion
Response Time @ 60Hz
Best Overdrive Setting
Normal
Rise / Fall Time
6.8 ms
Total Response Time
13.5 ms
Overshoot Error
1.3 %
Dark Rise / Fall Time
7.4 ms
Dark Total Response Time
14.7 ms
Dark Overshoot Error
2.8 %

Overdrive Setting Response Time Chart Response Time Tables Motion Blur Photo
Off Chart Table Photo
Normal Chart Table Photo
Fast Chart Table Photo
Faster Chart Table Photo

Since the 27UK650-W has a max refresh rate of 60Hz, the best overdrive setting is also 'Normal' and motion looks clear.

10
Motion
Image Flicker
Flicker-Free Yes
PWM Dimming Frequency
0 Hz

This monitor's backlight is flicker-free, which helps reduce eye strain.

We did notice some unusual behavior of this monitor. After testing the input lag, we noticed some significant panel flicker where our test patterns were situated. This flicker ghosting persisted for about 15 minutes after completing our test, 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.

It's only temporary and it's highly unlikely that most people will experience this during normal usage. We don't know if this flicker retention is caused by a defect in our unit, or if it's a built-in issue.

0
Motion
Black Frame Insertion (BFI)
Black Frame Insertion (BFI)
No BFI
BFI Maximum Frequency
N/A
BFI Minimum Frequency
N/A

This monitor doesn't have a black frame insertion feature to help reduce motion blur.

7.4
Motion
Refresh Rate
Native
60 Hz
Max Refresh Rate
60 Hz
Variable Refresh Rate
Yes
FreeSync
Yes
G-SYNC
Partially Compatible
VRR Maximum
60 Hz
VRR Minimum
40 Hz
VRR Supported Connectors DisplayPort, HDMI

The refresh rate of the 27UK650-W is okay. The 60Hz max refresh rate can go as low as 40Hz with FreeSync VRR technology, which might not be enough for some gamers. If you want a 4k monitor with a higher refresh rate, check out the LG 27GN950-B.

With NVIDIA's new FreeSync drivers, the 'Extended' mode didn't work properly, with constant tearing. However, the 'Basic' mode works perfectly and can be used up until 60Hz.

Inputs
8.9
Inputs
Input Lag
Native Resolution
8.8 ms
Native Resolution @ 60Hz
8.8 ms
Variable Refresh Rate
9.2 ms
Variable Refresh Rate @ 60Hz
9.4 ms
10 Bit HDR
8.9 ms
Black Frame Insertion (BFI)
N/A

Note: HDR input lag was measured using the HDMI port unlike the other measurements, which used a DisplayPort connection.

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

9.2
Inputs
Resolution And Size
Native Resolution 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 inch size, which gives it incredible pixel density and detail while having plenty of screen space to work on.