This is a conversion of my lighting rig to power three Xlamp LEDs as studio lighting, each channel using 2-3A and delivering about 20 Lux to a screen at 3m (without lens).
This is the kind of power I need to illuminate a screen and still be able to shoot video at ISO6400 or pref well below that.
That way I could shoot a realtime shadow play on a 3x2m screen using an effective point source. The sgadows will stay sharp even some distance from the screen and the shadowplay can take place in a 3D cone of light.
Cree Xlamp LEDs mounted on v slot as a heat sink, tripod for orientation