lumens- I am very confused, can someone explain? I read that lumens are very important and the higher the number for home theater the better. I also know it depends on how dark your room is going to be. Here's what baffles me-- I have read that the JVC DLA HD 100 is a very good projector and is a higher cost projector( $7900), however it only has a 600 lumen rating? Most of the time the reviews state that if not 1000 lumens or more it is NOT bright enough? There is some confusing and not clear information that the lumen output is different at different settings. Some reviews state that even though the rating of the projector states it is 1200 lumens it actually is only 300 lumens in HD mode. However no one rates the lumens in the high def mode??? So how do you know the REAL LUMENS output??? HELP