It is worth mentioning, right off the bat, that this projector fell short of its 3,000 lumen claim. Its brightest mode was measured at 2,264 lumens. Most projectors measure between 5% and 20% below claim, with the Acer hovering around the 25% mark. That said, brightness on this projector is slightly disappointing, even with Brilliant Color turned on, and even more so with Brilliant Color turned off - but more on that feature later.
Granted, I had about 125 hours on the projector before I was able to get around to measuring, so there was likely another 100 or so lumens to be found when the lamp was new, but still - not so good. We don't tweak projectors to squeeze every last lumen out either, because that degrades picture quality and we are simply not interested in that.
Now, even though these numbers are rather drastic, I still found this projector to be reasonably bright. Like I said, it can handle a fair amount of ambient light and still be watchable. It is obvious, though, that in the case of the H7550ST, Brilliant Color is the way to go. BTW in the old days, we used to consider any projector that measured 1500+ lumens in a good looking mode to be a "veritable light canon." These days, though, the Acer's 1500+ lumens in Standard make it closer in brightness to some dedicated home theater projectors than some of the brighter "bright room projectors"