LG UK6300 TV Review

Tested using Methodology v1.5
Updated May 08, 2018 at 11:53 am
LG UK6300 Picture
Mixed Usage
Value for price beaten by
: no price info
TV Shows
Video Games
HDR Movies
HDR Gaming
PC Monitor
This TV was replaced by the LG UM6900
Type LED
Resolution "4k"

The LG UK6300 is a decent RGBW IPS TV with wide viewing angles, so it remains accurate when viewed at an angle. It also has low input lag so feels responsive. Unfortunately, when viewed in a dark room, blacks appear gray due to the low native contrast ratio, but when viewed in a bright room, this isn't noticeable. The out of the ordinary "RGBW" pixel structure also can cause smaller details and straight lines to lose sharpness, especially when used as a PC monitor.

Our Verdict

6.4 Mixed Usage

The LG UK6300 is a decent TV for mixed usage. It has decent picture quality and a passable viewing angle, but it isn't able to overcome glare in a bright room and has poor dark room performance. It has a good smart interface and extraordinarily low input lag.

  • Feels responsive with low input lag
  • Short blur trail
  • Blacks appear gray in a dark room
  • Less accurate RGBW pixel structure
5.5 Movies

Not a good choice for movie lovers. It doesn't get very bright. Blacks aren't truly black and it has poor uniformity, so letterbox bars look cloudy. Subtitles don't look good due to the lack of a local dimming feature.

7.3 TV Shows

The LG UK6300 is good for watching TV Shows. Low frame rate content looks great. The TV isn't bright enough to be used in a bright room as it can't overcome glare, so daytime viewing is somewhat compromised. It has a good smart interface with a wide assortment of apps available for watching streaming TV.

6.9 Sports

Decent TV for watching sports. There is some dirty screen effect visible in the center of the screen, but it shouldn't be very noticeable. It has a good viewing angle great for game day parties, although it isn't very bright which might be an issue for daytime games in a bright living room. It has a good response time, so fast-paced sports don't have much motion trail.

7.0 Video Games

Good TV for video games, mainly due to the excellent low input lag when game mode is used. The TV has a good response time, so there is very little motion blur. It has decent picture quality, but some games suffer from the low contrast ratio.

5.3 HDR Movies

Disappointing HDR Movie experience. It has a poor native contrast and no local dimming feature. It doesn't support a wide color gamut and can't produce deep dark colors. There is almost no advantage to watching in HDR on the UK6300.

6.4 HDR Gaming

Decent HDR Gaming performance. Exceptional low input lag, and the response time is good, so there is very little motion trail. The mediocre peak brightness and lack of a wide color gamut means the HDR effect is not very noticeable.

7.6 PC Monitor

Decent PC monitor. It has excellent low input lag and a good viewing angle. The response time is good so there is little motion trail. The less accurate RGBW pixel structure means that text appears jagged as seen on the UH6500, even though the TV supports Chroma 4:4:4.

  • 6.4 Mixed Usage
  • 5.5 Movies
  • 7.3 TV Shows
  • 6.9 Sports
  • 7.0 Video Games
  • 5.3 HDR Movies
  • 6.4 HDR Gaming
  • 7.6 PC Monitor
  1. Update 5/21/2020: Converted to Test Bench 1.5.
  2. Update 2/21/2020: Converted to Test Bench 1.4.
  3. Update 3/4/2019: The VESA mount was incorrectly listed as 400x400. It is actually 200x200.
  4. Update 2/28/2019: Converted to Test Bench 1.3.


Test Results

Curved No

The design of the 2018 UK6300 LED TV is very basic. It is a very functional design with no serious deficiencies, but it won't be the center of attention in a room. Some of the rear-facing inputs may be difficult to access when wall mounted, and if a component connection is required it is impossible to mount the TV flush to the wall. There is no cable management.


The stand is almost the full width of the TV and is identical to the UJ6300 from last year. It is made of plastic and supports the TV well.

Footprint of the 55" TV stand: 33.3" x 8.6"

Wall Mount VESA 200x200

The back of the TV is very basic. There is no cable management. It is nearly identical to the UJ6300 from last year. Some of the inputs face out the back of the TV, which may be difficult to access if wall mounted.

Update 03/04/2019: The VESA mount was incorrectly listed as 400x400, it is actually 200x200 on the 43" model.

Borders 0.75" (1.9 cm)

The borders of the TV are thicker than on high-end models.

Max Thickness 3.19" (8.1 cm)

The TV is quite thick and will stick out from the wall if mounted.

Build Quality

Decent build quality on the LG UK6300. Nothing stands out as exceptionally good, but there is nothing worrisome either.

Picture Quality
Picture Quality
Native Contrast
1096 : 1
Contrast with local dimming

Mediocre native contrast ratio. Blacks are not truly black, and dark room viewing is less than ideal, especially taking into account the black uniformity results.

The contrast ratio is slightly worse than last year's UJ6300.

Note: The 50" model available in some areas has a VA panel, which we expect to have a higher native contrast ratio.

Picture Quality
Local Dimming
Local Dimming

The UK6300 does not have a local dimming feature. This video is provided for reference only.

Picture Quality
SDR Peak Brightness
SDR Real Scene Peak Brightness
191 cd/m²
SDR Peak 2% Window
187 cd/m²
SDR Peak 10% Window
198 cd/m²
SDR Peak 25% Window
198 cd/m²
SDR Peak 50% Window
198 cd/m²
SDR Peak 100% Window
198 cd/m²
SDR Sustained 2% Window
186 cd/m²
SDR Sustained 10% Window
197 cd/m²
SDR Sustained 25% Window
198 cd/m²
SDR Sustained 50% Window
197 cd/m²
SDR Sustained 100% Window
197 cd/m²

Mediocre peak real scene with the more accurate Expert (Dark Room) picture mode. There is almost no variation depending on content.

For a brighter room, the Standard picture mode with our recommended settings and a W30 color temperature is better, peak brightness is 286 cd/m². In Vivid mode with the default settings, the UK6300 is much brighter at 364 cd/m², although a lot of color accuracy is lost in that mode.

It is a bit brighter than the UJ6300, especially when the other picture modes are used.

Picture Quality
HDR Peak Brightness
HDR Real Scene Peak Brightness
296 cd/m²
HDR Peak 2% Window
223 cd/m²
HDR Peak 10% Window
315 cd/m²
HDR Peak 25% Window
313 cd/m²
HDR Peak 50% Window
312 cd/m²
HDR Peak 100% Window
311 cd/m²
HDR Sustained 2% Window
222 cd/m²
HDR Sustained 10% Window
312 cd/m²
HDR Sustained 25% Window
311 cd/m²
HDR Sustained 50% Window
310 cd/m²
HDR Sustained 100% Window
308 cd/m²

Mediocre HDR peak brightness. The LG UK6300 is not bright enough to overcome glare in a bright room, but due to the poor black uniformity, it is not well suited to a very dark room. Like with SDR content, small highlights in some scenes do not really pop, brightness is very similar regardless of content.

Picture Quality
Gray Uniformity
50% Std. Dev.
4.761 %
50% DSE
0.201 %
5% Std. Dev.
0.597 %
5% DSE
0.081 %

Decent gray uniformity. There is some dirty screen effect near the center, but it is not too noticeable when watching sports. The edges of the LG are noticeably dimmer than the rest of the TV and there are some dark vertical bands.

Picture Quality
Viewing Angle
Color Washout
24 °
Color Shift
70 °
Brightness Loss
29 °
Black Level Raise
70 °
Gamma Shift
40 °

Mediocre viewing angle but better than almost all VA TVs. Black levels stay accurate regardless of angle, but colors shift noticeable at moderate angles.

Note: The 50" model has a VA panel, which we expect to have a worse viewing angle.

Picture Quality
Black Uniformity
Native Std. Dev.
3.324 %
Std. Dev. w/ L.D.

Poor black uniformity on the UK6300. There is no local dimming feature, and there is clouding across the entire screen when displaying the test cross. The edges of the screen are darker than the rest of the TV and there are vertical bands visible throughout.

Picture Quality
Screen Finish
Total Reflections
3.2 %
Indirect Reflections
0.8 %
Calculated Direct Reflections
2.4 %

The UK6300 has good reflection handling. The semi-gloss screen diffuses direct reflections across the screen. The screen is not very effective at overcoming glare.

Picture Quality
Pre Calibration
White Balance dE
Color dE
Color Temperature
6444 K
Picture Mode
Expert (Dark Room)
Color Temp Setting
Warm 2
Gamma Setting

Mediocre color accuracy out of the box. The Expert (Dark Room) picture mode has the most accurate colors. The white balance and color balance dE are high enough that most people would notice it. The gamma curve is mostly flat, and not too far off from our 2.2 target.

Picture Quality
Post Calibration
White Balance dE
Color dE
Color Temperature
6502 K
White Balance Calibration
20 point
Color Calibration
Auto-Calibration Function

Calibration was long, but very effective. White balance is almost perfect, and color dE is low enough that most people won't be able to see any inaccuracies. Gamma follows the target curve almost perfectly, and color temperature is almost perfect.

You can see our recommended settings here.

Picture Quality
480p Input

Upscaling of low resolution content such as DVDs is good.

Picture Quality
720p Input

720p content including cable TV looks good. There are no obvious artifacts or softening of the image.

Picture Quality
1080p Input

1080p content like from a Blu-ray or non-4k games looks good.

Picture Quality
4k Input

The less accurate RGBW pixel structure results in some artifacts, producing results similar to the UH6500 as can be seen here. This is especially noticeable when using the UK6300 as a PC Monitor.

Picture Quality
8k Input
Picture Quality
Picture Quality
Color Gamut
Wide Color Gamut
DCI P3 xy
77.44 %
DCI P3 uv
83.64 %
Rec 2020 xy
55.65 %
Rec 2020 uv
61.28 %

Standard color gamut, only good enough for SDR. See our recommended settings for the most accurate colors here.

The Expert (Dark Room) EOTF follows our curve perfectly, and the brightness rolls off gently as the TV approaches its peak brightness.

The PC and Game EOTF curves follow the input closely but are under the curve a bit. In these modes, the brightness rolls off gently at the peak brightness of the TV, so there is less clipping.

Update 06/29/2018: The DCI P3 xy and DCI P3 uv results were swapped when entering the data. This has now been fixed, and the score and performance are unchanged.

Picture Quality
Color Volume
Normalized DCI P3 Coverage ITP
56.1 %
10,000 cd/m² DCI P3 Coverage ITP
20.2 %
Normalized Rec 2020 Coverage ITP
40.1 %
10,000 cd/m² Rec 2020 Coverage ITP
14.2 %

Poor color volume on the UK6300, similar to the UJ6300. The TV's RGBW structure cannot produce colors as bright as pure white. It also cannot produce very good dark colors.

Picture Quality
Color Depth
10 Bit
Red (Std. Dev.)
0.090 dE
Green (Std. Dev.)
0.116 dE
Blue (Std. Dev.)
0.081 dE
Gray (Std. Dev.)
0.105 dE

There is small banding throughout our gradient test, especially in grayscale and the darker greens. Real-world tests show some banding in movies with large areas of similar colors, like the outside shots in The Martian.

Picture Quality
Temporary Image Retention
IR after 0 min recovery
2.88 %
IR after 2 min recovery
0.42 %
IR after 4 min recovery
0.17 %
IR after 6 min recovery
0.00 %
IR after 8 min recovery
0.00 %
IR after 10 min recovery
0.00 %

The LG UK6300 suffers from image retention, and it is quite noticeable with our test image. These results are disappointing, almost as bad as last year's UJ6300. These results are among the worst image retention of any TV we have tested.

Picture Quality
Permanent Burn-In Risk
Permanent Burn-In Risk

Although some IPS panels can suffer from temporary image retention, this doesn't appear to be permanent as the IPS panel in our long-term test appear immune.

Response Time
80% Response Time
7.9 ms
100% Response Time
15.0 ms

The response time is good. There is some overshoot with the 0-20% slide which causes a much higher response time on dim scenes. There is very little motion trail.

PWM Dimming Frequency
120 Hz

The TV uses PWM to dim the backlight, and there is flicker at all backlight levels. This flicker helps to clear up motion a little, but results in duplications in fast moving objects.

The 'Standard' picture mode is brighter. In this mode the backlight stays on longer, as shown in this plot.

Black Frame Insertion (BFI)
Optional BFI
Min Flicker for 60 fps
120 Hz
60 Hz for 60 fps
120 Hz for 120 fps
Min Flicker for 60 fps in Game Mode
120 Hz

Same as the UJ6300, there is no option to reduce the flicker frequency to 60Hz.

Motion Interpolation
Motion Interpolation (30 fps)
Motion Interpolation (60 fps)

The LG UK6300 can interpolate lower frame rate content up to 60fps. As this is a 60Hz panel, it can't interpolate 60fps content. When motion interpolation is enabled there are visible artifacts.

Frame Hold Time @ 24 fps
26.7 ms
Frame Hold Time @ 60 fps
1.7 ms

The LG UK6300 is good at displaying content without stutter. 24p movies have less visible stutter, especially with wide-panning shots.

24p Judder
Judder-Free 24p
Judder-Free 24p via 60p
Judder-Free 24p via 60i
Judder-Free 24p via Native Apps

Only 24p content played from a true 24p source like a Blu-ray player are judder free. The UK6300 can't remove judder from 24p sources played from a 60p/60i source like a cable box.

To play 24p movies without judder when playing from a Blu-ray player, the 'Real Cinema' setting must be enabled.

Variable Refresh Rate
Native Refresh Rate
60 Hz
Variable Refresh Rate
G-SYNC Compatible
4k VRR Maximum
4k VRR Minimum
No VRR support
1080p VRR Maximum
1080p VRR Minimum
No VRR support
1440p VRR Maximum
1440p VRR Minimum
No VRR support
VRR Supported Connectors
No VRR support

The LG 43UK6300 does not support any of the variable refresh rate technologies like Freesync.

Input Lag
1080p @ 60 Hz
11.5 ms
1080p @ 60 Hz Outside Game Mode
134.5 ms
1440p @ 60 Hz