"William Sommerwerck" wrote in message
...
Discharge lamps would no doubt be more efficient. But...
not only would you have to correct for color balance, but
the bulb would have to be "mated" to the projector's optical
system.

Large theater projectors are still an arc light?

I'm not sure. I seem to recall that some use some form of tungsten
lighting.
Don't hold me to it.


I seem to recall that modern cinema projector lamp houses make use of
short-arc xenon discharge lamps, but as you said, don't hold me to it ...

Arfa