yep, try using the eco mode of your projector assuming it is in full/normal lamp mode now. The lamp will loose some light output after it is used for several hundred hours. You can try adding a very small amount of bias lighting (some dimable light that does not shine on the screen) this helps keep your pupils closed on ark sens so you don't get as much eye strain. Or add a neutral density filter to the projector (ND filter) which will reduce the light and not mess with the color (assuming a quality filter) Also use cinema/movie mode and at the very lease use a calibration disk to set brightness/contrast etc.. full calibrations would be advised once the lamp has a few hundred hours on it.
If you are near (reasonable driving distance) from Philadelphia, pm me, I work for Tip and gas money, not a pro but I have good gear and own an HP screen which requires a few trick to get a good calibration.. DUH! Canada is just a tad to far..