Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Reexamination Certificate
2006-05-29
2009-11-17
Le, Que T (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
C250S238000
Reexamination Certificate
active
07619193
ABSTRACT:
The present invention relates to a control system (10; 30; 50) for a LED luminary (12) including a plurality of LED light sources of multiple colors for producing a mixed color light. The control system comprises means (22) for controlling the LED light sources in accordance with a difference between set point values representing a desired light output and first control data provided by at least one optical sensor (14; 32) responsive to a property of the light produced by the LED light sources. The control system is characterized by means (26; 38) for compensating said set point values in accordance with second control data provided by a temperature sensor (24) responsive to the temperature of the optical sensor(s) (14; 32). The additional temperature sensor makes it possible to compensate for changes in the spectral sensitivity of the optical sensor(s), whereby the color stability of the LED luminary with integrated optical sensors can be increased. The invention also relates to a corresponding control method.
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Bennett Jennifer
Koninklijke Philips Electronics , N.V.
Le Que T
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