Equi-visibility lighting control system

Details Equi-visibility lighting control system Equi-visibility lighting control system

1980-01-18

1981-06-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

315158, 250214AL, G01J 132

Patent

active

042739993

ABSTRACT:
A system and method for providing substantially constant visibility over a ask area within a work area with time in which the visibility provided by natural daylight illumination is supplemented by a variable artificial illumination from luminaires to maintain a specified visibility. The background luminance and the difference luminance are determined as a function of the artificial illumination and the natural daylight. These relationships are used to determine the actual visibility at the task. The actual visibility is then compared with a criterion visibility and the intensity of the artificial illumination from the luminaires is varied to bring the actual visibility to the criterion visibility.

REFERENCES:
patent: 4135116 (1979-01-01), Smith
patent: 4158132 (1979-06-01), O'Dell

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