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For totally dark room I use Eco mode and THX. Note sure if one negates other but I think not. I do suggest that you have decent convective heat transfer for your lamp. As I stated somewhere, we have 15' ceilings and so the ceiling fan stays out of the way.. Also, the room was built from the beginning as a media room. With all of the 8700UB bulb failures I have read about my guess is that either there is poor cooling to the lamp or thermal shock from rapid changes is lamp temp. or a combination of both. For a do it yourself set up perhaps a small quiet focused fan to move the heat.

Hope this helps.