Lighting control with season detect

Details Lighting control with season detect Lighting control with season detect

2007-01-02

2010-06-22

Vu, David Hung (Department: 2821)

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Discharge control discharge device load controlled by the...

C315S150000, C315S159000

Reexamination Certificate

active

07741786

ABSTRACT:
An outdoor lighting control method and apparatus for use with an outdoor lighting fixture that automatically detects the changing length of the day and provides for automatically turning off the light after a shorter period of illumination during shorter summer nights and after a longer period of illumination during longer winter nights. The control method measures the elapsed time interval over which night sets in, for example, by sensing light levels characteristic of the onset of dusk and the onset of night and measuring the elapsed time between the two sensed light levels, and then automatically turns on the lighting fixture for nighttime operation for a duration that depends on the measured elapsed night-onset time.

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patent: 6927541 (2005-08-01), Lee
patent: 2003/0062841 (2003-04-01), Norling
patent: 2005/0259416 (2005-11-01), Gauna et al.

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