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Bauer produced the projection lamps for their cinema projectors
themselves. They also produced a mirror that was built of several
layers to reduce the heat. Philips/Osram took that idea, designing
a mirror that was built up from several layers that did reflect the
light but let the infrared beams through, which meant a 70%
reduction in heat. Next they turned the lamp into a horizontal
position so that it became impossible for the light of the filament
to go directly to the frame. With a specially designed filament and
a special elliptical mirror it became possible to avoid overheating
while achieving a very high light output. The ideal situation had
been reached with the cold light mirror lamp. Fig 18. Cold light mirror lamp.

This article first appeared in Back Focus, the journal of the Australian Photographic Col-
lectors’ Society Inc. It is reproduced with the permission of the author and the Back Focus
editor.

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ANY FEATURES

Especially: Pocahontas, a Bugs Life, Mulan, The Lion
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Contact Jason on 0411 333741 or email
jgronn@outlook.com