Yeah, I gotta agree with Mike and John here, John. If projector lamps didn't need to be actively cooled when turned off, projectors wouldn't run the fans for 5 minutes when powered down.
EDIT: Here's my totally made up hypothesis: while the projector is on, the bulb is clearly hot. The fan keeps the glass of the bulb cool, but obviously can't do anything (nor should it) to keep the filament (or whatever the actual light source is) cool. When the power cuts out, the fan stops, as does the light. However, the glass can heat up because the filament (or light producing element) will still be radiating heat. If the glass heats up too much, well then...
Last edited by kcarlile; 04/15/08 03:47 PM.
