Beam  (1974)
Berkey Colortran

Berkey Beam

From Theatre Design & Technology, December 1974

Berkey Colortran, a division of Berkey Photo, Inc., announces its latest development....
Designed for theatrical applications, the Berkey Beam represents the first significant design innovation in theatrical lighting equipment in 30 years.
The Berkey Beam is a variable spread ellipsoidal reflector framing spot light. A rack and pinion zoom focus mechanism provides a continuously variable beam angle from 24° to 43° with soft and hard edge control.

A 1000 watt Tungsten Halogen lamp in a unique optical train develops 140,000 beam candlepower. An offset radical shutter design provides 60° angular rotation anywhere in the gate, with up to 120 degrees total angular rotation between blades.

Lenses are fabricated of low expansion Borosilicate glass and supported by shock absorbing silicon rubber mounts.

A joy stick control permits rapid optical alignment. Color frames are secured by a safety latch. A pattern slot is standard and a new precision socket assures proper lamp positioning. The Berkey Beam is 26"' long, 14.5"' wide, 27" from top to bottom and weighs 34 Ibs.

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