Hi, I am a Art Teacher which finally been able to receive a budget for a new projector for our Auditorium/Theatre we have in school, which we use for movies/videos or to playback video clips or pictures during student art galleries. I have been advised by a former collegue to look at the BenQ SP870 as she claims that it is a great projector that she has been using for over a year now at all her galleries and shows. She says its perfect for almost all scenerios as it can project clear images in dark or bright conditions. She also mentioned to me that is is not heavy (almost 5 KG) so it is quite mobile if I'd need to move it for different placements. Is 5000 lumens a lot? She said the projector is really bright, but I'm curious if 5000 lumens in projector terms would be enough for a room that is well lit, such as an art gallery? Well, I mean well lit, not flourescent lit, haha. Each artwork would have their own lamps on it. Anyway ever owned the BenQ SP870 or had contact with it before? Any advice about the projector would be appreciated, thank you.