Originally Posted by Ron Jones
This is taking one instance and trying to apply to all projectors, hence a blanket statement.
Single chip DLP projectors that have other than just RGB colors in their color wheels, and especially those with a white (clear) segment, do produce an overall image brightness, with real video, that is less than what is indicated from a full white test pattern measurement (sometimes a lot less). However, when the DLP only uses RGB in the color wheel the lumens measurements, taken with a 100% white test pattern, will reflect the actual lumens output for normal video just as it does for all 3-chip projectors (be they LCoS, LCD or DLP).
Measuring the white point of an LCD or LCOS in MAX lumens mode does not guarantee you that the colors are properly luminated at different saturation points, I'm not sure how you are getting to that.
It's not a relative comparison because the gamma and/or gray-scale of all these projectors is so far off in those max torch modes that the brightness in the mid-tones and the actual colors you see are so distorted that any such comparisons need to made individually between each projector. LCD's share many of the same issues at max torch modes as a DLP does that has a white segment in its color wheel, have you measured the Gamut and Gray-Scale of your Epson at 2200 lumens? The Epson also does not produce the correct saturation and luminance in its absolute brightest mode.
In fact, all these projectors have their own individual issues at or near max torch mode, including some that have gamuts that are so wide that the comparison isn't even relative. Although it is true the DLP with a white segment experiences the issue more severely than a DLP without a white segment, the effect is not visible to the entire spectrum of colors and it does not mean that an LCD will have better color as a % of its near-brightest mode to absolute brightest mode.
The white segment in the color wheel is not a ZERO sum gain, there are gains at some points and losses at others. For instance, the best projectors for projecting the most accurate color at the highest lumens are in fact the Benq sh910, Optoma eh505, Viewsonic pj7820hd and similar projectors. It doesn't mean they are perfect at these high lumens, it just means they have decent modes which are far brighter than a regular HT projector. If what you are saying is true, you are saying that projectors that can do 3000+ lumens that have white segments are no better than projectors that have 2000 lumens without a white segment at fighting ambient light in video, and this is incorrect.
What is CORRECT to say is that the best modes of projectors with white segments are not as clean as the best modes of projectors without white segments, but the white segment actually is an advantage when it comes to video brightness as long as you realize you are giving up some accuracy for the lumens bump.Edited by coderguy - 10/6/13 at 4:48pm