Originally Posted by NxNW
At first glance I don't see anything too crazy. If the W2000 is 11.5' away from the nearest edge of the screen you should get a peak of over 300 lux at the brightest region of the image. Maybe even 350. Try the technique coderguy mentioned, do not just hold the meter oriented with the enclosure pressed flat against the screen, try angling it to face the lens itself, and continue adjusting the orientation until you get the highest possible reading at that location.
Oh and when I saw the remark about using a lux meter on a Dell monitor, I realized there may be some misunderstandings about the difference between luminance and illuminance. I replied over in that other (ALR) thread you linked to. Short answer: for our purposes, a lux meter is only ever pointed at the lens of the projector, never the screen.
The MT912 has more of an enclosed sensor (the 1010B it's exposed) can't it be used for measuring the monitor if placed as close as possible to the screen?
Used the wrist with the meters instead of keeping them flush against the screen but the increase of small, for instance 196lux vs 190 previously.
The center measures 196 (238 on the MT218) and the brightest part which to the lower left of the center has 244 (282). I don't know which meter is accurate. @coderguy
tested a LX1010B a while back with some better meters and found it ok.
Projection dream and Projector central both measured the W2000/HT3050 and got around 1200lm with 100% zoom in Cinema Full lamp. The other reviews had similar or higher measurements:
Lumen values right now, with the average of center, four corners, and the bright spot make 179lux and 213lux for the MT218, or 555lm/659lm.
The light loss from zooming out from two calculators (HT3050 with PC and WebC) is 26% and 21%.
Didn't move the projector. Took readings just in front of the screen.
After that zoomed to 100%. Took a piece of paper where an 106" screen would have been (8'10"/270cm) and (after focusing) took readings at the height where the center of the screen would have been (same height as the current screen).
Loss of light was 20% on one meter and 17% on another. Average 18%.
So definitely not 5, 9 or even 27%. WebC was closest. Makes you question all the measurements found online.
327h is 225 equivalent in Full lamp. That's about 12% brightness loss. 1200lm at 0% zoom is 984lm. Let's say the lamp lost 12% brightness, 865lm.
That is still 30% more than the 607lm (555/659) averaged. Even with the meter that read's the higher lumen, 659, that's 24% more.
WebC with 200h and 10% brightness loss, at 1.5x, in Full lamp Calibrated the result is 489 lumens.
Can dust inside the light path affect brightness?
What about refresh rate/color wheel rpm? There was no noticeable difference between 23 and 60Hz.