Hello there. I am installing a home theater system. I'll have an 82" 16:9 screen. The room will have a decent amount of ambient light. The windows will be open during the day, but no light from the windows will shine directly on the screen. The interior lights can be dimmed, but probably will not be off completely during the day. On balance, I'd say that the room will be moderately-lit during the day. (Of course, during the night, ambient light won't be a problem.) I'm looking at the Sanyo PLV-70, the Infocus 7200, the BenQ8700, and the Sony HS20. I previously had assumed that I needed to get the PLV-70. Now, I think I might be able to get away with something less bright. The house's previous owners had installed a dropdown Stewart Luxus screen. Unfortunately, I haven't been able to drop it down yet, and thus I don't know what its gain is. Hopefully, I'll figure that out in the next few days and will plug it into my calculations. My question is, what is the ideal amount of foot-lamberts for a room that will be moderately lit some of the time and fairly dark other times? My impression is that 30 F-L is a fairly good number. If that's the case, I probably don't need the PLV-70. Also, when you all are calculating F-T, do you generally discount the manufacturer's listed lumens by a certain percentage (I know that the listed amounts are usually somewhat inflated)? If so, how much of a discount should I use?