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Just to emphasize the sensitivity problems with the vidicon camera:
The minimum studio light level suggested was 2000 foot candles (over 21,000 lux); while the recommended level for the earliest TK-41s was 400 foot candles (over 4300 lux).
Approximate values for comparison:
Direct sunlight 100,000 lux
Open shade 10,000 lux
Overcast 1000 lux
Recommended for desk work, kitchens 300-500 lux
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Old TV literature, New York World's Fair, and other miscellany
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