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The lighting level for TK-41 cameras was nominally 400 foot-candles (4306 lux). The NAB engineering handbook recommended installing cooling capacity for a heat load of 100 watts per square foot of studio space.
[For comparison, sunlight is somewhere around 6700 foot-candles (varies with angle of incidence).]
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Old TV literature, New York World's Fair, and other miscellany
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