NASA NTRS · 19770000023
Demand-controlled lighting
Abstract
Automatic lighting is controlled by photocell that measures intensity of available light. Photocell drives motor which operates mercury switches controlling indoor illumination sources. Device effects increase in indoor illumination intensity when illumination input to cell is insufficient. Reverse is true if input is too great.
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Owens, L. J.. 1977-06-01. Demand-controlled lighting. https://ntrs.nasa.gov/citations/19770000023
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