I got an old slide projector last year to display some moving gears for a steampunk event downtown. It uses a 200 watt projector bulb and gets quite hot. Inspired by a friend’s conversion of a similar projector (he converted to an LED and also had a photo flash and used for studio photography). I didn’t see his conversion so I just jumped right into it.
I purchased a 30 watt COB LED from superbrightleds.com: