i have 2 projector in one room, we make for window and linux into dual display, At first we install there is no problem with the colour, but after almost 1 year the colour in each projector are different. life time projector show 2525 hours in left, and in the right projector 2740, i am still wondering what wrong with my projector, i have try to clean the filter every 100 hours but its seam same condition, please give me some advice, change the lamp or the projector ? .... Thanks