In article ,
William Sommerwerck wrote:
Discharge lamps are not continuous-spectrum sources, and would probably
not work very well when projecting color images. And with mercury, you'd
have to filter out the UV, not to mention the ozone generated by the UV.

They're used for lighting on film and TV so can be pretty good. As well as
for DLP etc projectors.

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*A 'jiffy' is an actual unit of time for 1/100th of a second.

Dave Plowman London SW
To e-mail, change noise into sound.