BenQ TK800 Home Theater Projector Review - Performance

July 3, 2018 / By Art Feierman

BenQ TK800 Home Theater/Home Entertainment Projector Review - Performance: Brightness, Brightness and Color Temperature, Color Temp Readings for Reference Mode, Post Calibration Color Temp Readings for Reference Mode, Gamma Measurement, ECO Mode: Affect of Brightness, Power Consumption, Lens Position: Affect on Brightness

Brightness

The TK800 came very close to the 3000 lumens it claimed.

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Picture ModeLumensColor Temp. (Kelvin)
Bright28508290K
Vivid TV21289342K
Cinema19767448K
Sport21427633K
Football21427863K
User 121289369K
User 221289369K

No question about it, BenQ's TK800 is a good deal brighter than its "home theater" twin, the HT2550.  The TK800's RGBW color wheel pumps out a lot more white lumens, although probably slightly less color lumens than the HT2550, to create a home entertainment projector that can cut through more ambient light.  BenQ definitely succeeded!  Consider:

The HT2550's brightest measured mode was their Bright mode, at 1793 lumens, while this TK800's least bright mode was even brighter:  Cinema mode at 1976 lumens, almost exactly twice as bright as the HT2550!

Bright mode on this TK800 is 2850 lumens - 50% brighter than the same mode on the other BenQ.  that's true of most modes on the TK800, except Cinema with the even bigger difference.

The TK800 is truly a light cannon, compared to most competitors.  Even calibrated for "best" mode it managed 1007 lumens, but our 4K HDR calibration came in at 2090 and the Bright mode for non 4K HDR, manages to  dazzle, with 1933 lumens measured!   While 1007 lumens isn't that much more than the HT2550s (20% more), remember, 1000 lumens is officially enough to fill a typical 150" diagonal screen in a fully darkened theater.  (Call it an easy 130" with brightness to spare).

Perhaps more importantly is the good color combined with just over 2000 lumens for HDR, where the extra lumens are really appreciated (and called for)!

Brightness and Color Temperature

The same chart above shows the color temperature of each mode when measured. These numbers are all pre-calibration.  All of the modes are at least a bit cool.  Starting at almost 7500K, with others getting up to even 9000K.  Fortunately those can be dialed down as needed.

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Many folks like a cooler temp for sports viewing - I count myself among those, so I tend to prefer something around 7000K but generally not more than 7500K.  I was perfectly happy with Sports / Football modes for my sports viewing pleasure.  Vivid TV sizzles, though, it's a very interesting, very fun mode, although in theory, the least accurate, with it's color temp in the 8000-9000+ Kelvin range.

Color Temp Readings for "best" mode: Calibrated Cinema

IRE RangeColor Temp. (Kelvin)
100 IRE6436K
90 IRE6433K
80 IRE6488K
70 IRE6570K
60 IRE6566K
50 IRE6547K
40 IRE6651K
30 IRE6446K
20 IRE6494K
10 IRE6288K

With a target of 6500K, for greyscale balance, post calibration the BenQ TK800 is close to ideal, with a nice tight range, only a bit warm in the very darkest areas (10 IRE), where you are very Not Likely to notice.

Post Calibration Color Temp Readings for 4K with HDR

The measurements below were taken at full power on the lamp.  The brighter ranges are cooler than the lower brightness ranges.  Not sure why Eric couldn't get the 70 IRE and up to be a bit warmer - closer to D65, but the pictures look pretty good.  I would say when you see the 4K streaming images from Blacklist, showing the building (inside or outside images) you can see that slightly stronger blue intensity to the whites.

IRE RangeColor Temp. (Kelvin)
100 IRE7366K @ 2090 lumens
90 IRE7374K
80 IRE7356K
70 IRE7028K
60 IRE6650K
50 IRE6612K
40 IRE6640K
30 IRE6662K
20 IRE6560K
10 IRE5966K

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TK800 Gamma Measurement "best" mode

Pre-Calibration: Average Gamma 2.4 targeting 2.2

Post-Calibration: Average Gamma 2.27

For more casual viewing than movies - I'm thinking sports, or most TV, most prefer a lower gamma which yields a brighter mid-range to the picture.

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ECO-Mode: Affect on Brightness, Power Consumption

Power ModeLumensColor Temp. (Kelvin)
Full Power (Bright Mode)28508290K
ECO Mode (Bright Mode)19868752K

From any color mode, switching from full power (High) to Low power mode, results in a measured drop in lumen output of about 29%.

That, I should point out, is pretty typical with almost all projectors dropping between 25 and 35 percent when going to Eco (Low).

Lens Position: Affect on Brightness

ZoomPicture ModeLumens
Wide (Zoom Out)Bright1811
Mid-ZoomBright1793
Telephoto (Zoom In)Bright1713

I'm saving some time here.  This chart is populated with the measurements from our HT2550 review.  Consider that the two projectors have the same lens, and also that the difference between wide-angle and telephoto brightness will be minimal on projectors with very little zoom range (1.2:1 in this case, which is very minimal).  Turns out on the HT2550 the brightness variation as you zoom from wide angle (closest placement to your screen), to the furthest (tele zoom) is only 7%.  Since that is barely visible, I didn't bother to do the same measurements on the TK800.

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