I was reading Surpaguy's plog and came acroos this quote

This observation from Supra meshes with my own observations. I currently have an average lux of about 64 on my screen and can watch TV with medium controlled lighting. Supra states that an average lux of 119 is a little too bright.

One of my goals is too increase my brightness as much as possible so that I have a wider range of adjustments for brightness, contrast, use of a gray screen, etc. After all, I can always find ways to decrease the brightness to my optimal amount. However, if I get just a little extra brightness, maybe to 85 average lux, then I would be happy because it would allow me to reduce my brightness setting on my converter box (and thus reduce the crushing white on bright scenes).

Could those who have a lux meter to tell us the average lux on thier screen and how satisfied they are with it. Also include, based on your current experience, what you think would be an optimal lux for your screen. I think this would be valuable for those who are just starting out and have to decide on a screen size/projector system.

Two places to follow-up on this:

http://www.lumenlab.com/forums/index.php?s...ndpost&p=101738

and

http://www.lumenlab.com/forums/index.php?s...ndpost&p=127350

I for the most part agree. Although I will say that I feel it is up to individual lcd's also. I believe you want you projection to look just like your lcd would normally not disassebled. So, if you normally would have it set at 50% brightness like mine was. Then you would want your viewing to be about that when projected. This is because I believe at that setting, you are about the perfect contrast ratio. Thus, dark scenes and bright scenes should look just like your original lcd, but only alot bigger. Now, I regress, to say, yes, at 100 average lux, it seems to be about perfect. I feel they both kind of go together. Without being able to achieve the 100 average lux, you may be short on brightness, thus need to adjust the brightness. Therefore, you can achieve almost the same viewing at 80 lux, but you end up turning the brightness up, and loose some contrast. It is a give and take situation. If you can only achieve 80 lux for the size you want, you have to make other adjustments to compensate. JMHO

Well I'm projecting at 180" diagonal and I have an average of around 30 lux and my brightness and contrast are set at around 65%. And it's just about perfect. It's brighter than most movie theaters and there isn't a "white crush" problem.

My average lumens are around 285. That's why I've always said that lumens are more important than lux.

Don't you have a +gain screen that adds brightness though? What is the equivalant of lux, if the screen wasn't being used. I am thinking that with the screen, you may be around 100lux in theory.
30 lux X Gain

Yea it's a 2.8 gain screen.

You're right , when I was projecting on 2 pieces of plastic I had to turn the brightness and contrast up. Good catch.

You happy with your screen? I am thinking about a Dalite screen, since I can get a 106" for $100. I am really contemplating it. Although, I will say, I am not exactly sure what the brightness gain is on that one. It is directly from Dell, so i need to call them and find out what it is.

I'm thrilled with it, I would NEVER go back to anything else. It makes the colors "pop" out and it's bright enough that you can turn down the brightness and contasrt so that you don't have the bad"white crush".

So far, it looks like a lux of around 80 - 100 is the consensus here.