Originally Posted by Dave Harper
Sorry I don’t recall you asking that, but I’m sure you did.
The green is easily the highest, followed by blue.
The filters I am trying ate up 50+% of the light. I do need to play some more to see if I can get some back.
I was referring to someone else who I asked earlier to show me what the RGBs looked like when they were maxed out - by raising the RGB gains you will see usually see the green has the most energy, followed by blue, and then red, but to be sure, it would be useful to see the results via calibration software so we know what the 'raw' output of the lamp is.
Most projectors have a dynamic or vivid mode which is a long way from a calibrated setting and is the mode that usually gives the most lumens. That's the setting that often works the best with a filter.
When you calibrate a pj to D65, it's not unusual to lose 40% of the lumens and contrast compared to one of the projectors brighter video modes (like 'dynamic' or 'vivid') , but when you do that, the black level remains the same - reducing the cuts are what cost you lumen and contrast output, and most of that is caused by reducing the green.
By increasing the RGBs to their max, you obviously make the image even less appealing for video usage but can end up with more lumens and contrast than the 'vivid' mode for example - you don't always have to go into the service menu to get more lumens.
So, lets say that in 'vivid' mode you have 1000 lumens, and 1000:1 on/off CR. When you calibrate to D65 you end up with around 600 lumens and 600:1 CR but the same black level. By increasing the RGBs to max, you may end up with even more lumens and contrast than vivid mode gave you, with green and blue giving even more energy than in the vivid mode - lets say 1400 lumens and 1400:1 CR. By adding the FL-Day you will cut the image to 700 lumens but still with 1400:1 CR. Because red has been boosted and is closer to green and blue, you don't have to reduce the cuts so much, so may end up with 600 lumens (same as without the filter) but 1300:1 on/off CR.
That's the theory and a best case scenario - usually you don't end up getting all the lumens back that you had lost with the filter, but quite often it's not a big loss - as you can see from the results Chromapure achieved, he only lost around 10% of the lumens, but improved the black level and increased the on/off CR by over 2000:1.
Using that example - the standard pj at D65 gave 1096 lumens and 7981:1 on/off CR, so a black level of 0.15 lumens.
With the stage one filter at D65 he got 980 lumens and 9320:1 contrast - just a 10.6% drop in lumens which is unlikely to be noticeable, but with a contrast increase of 131% to 9320:1 and a black level of 0.10 lumens, which is approx a 50% improvement and is usually visible. That 50% is consistent with adding a filter.