Device for measuring lighting effectiveness

Details Device for measuring lighting effectiveness Device for measuring lighting effectiveness

1975-11-12

1977-02-15

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

356121, H01J 3912

Patent

active

040083918

ABSTRACT:
Instrument for measuring the quality of light illuminating a work area. The device comprises four photocells arranged in a cubical housing facing in different directions and connected to calibrated operational amplifiers and an analog divider. A volt meter with suitably calibrated scale is connected to the analog divider to provide a direct reading of the ratio of quantity of light from the different directions.

REFERENCES:
patent: 2308095 (1943-01-01), Meeder
patent: 2714327 (1955-08-01), Squyer et al.
patent: 3448273 (1969-06-01), Webb
patent: 3475613 (1969-10-01), Meyers
Lewin & Holt "A Proposal for ESI Ratings" Illumination Engineering Society Apr. 1973, p. 217.

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