caught a glimpse of a smaller and more affordable dlp rptv this past weekend. dont quote me, but i think it was a 42" samsung and cost 3999. we were at frys, and they had it off in the weeds. it was the best looking thing in the whole store. so i was having lunch with a friend yesterday and i told him about it, and how i didnt want a projector cause i didnt want to foot the bill for bulb replacement every 1500 hours or whatever it is, but i really liked the tv i saw. he said, 'but dont you have a bulb that needs to be replaced in a dlp rptv?' i hadnt thought about that at all. is it the case? it this also true for the lcd ones? what is the light source anyway? forgive me if this is elementary. i do not recall seeing it discussed here before.