I would think anything that is a cover for a radiator is going to conduct heat by design.....not very wise to block radiator heat! How about an inert baffle to block the heat near the projector.
Why not use a ceiling mount and save your lamp - you will still get half the HighPower gain - the projector is plenty bright - so that is sufficient gain!
Why not use a ceiling mount and save your lamp - you will still get half the HighPower gain - the projector is plenty bright - so that is sufficient gain!