LED lighting system

Details LED lighting system LED lighting system

2006-06-27

2006-06-27

Philogene, Haissa (Department: 2828)

Electric lamp and discharge devices: systems

Plural load device systems

C315S362000, C315S294000, C315S309000, C345S083000, C345S101000, C362S800000

Reexamination Certificate

active

07067995

ABSTRACT:
Method and system are disclosed for compensating for color variations due to thermal differences in LED based lighting systems. The method and system involves characterizing the LEDs to determine what PWM (pulse-width modulation) is needed at various operating temperatures to achieve a desired resultant color. The characterization data is then stored in the microprocessor either in the form of a correction factor or as actual data. When an operating temperature that is different from a calibration temperature is detected, the characterization data is used to adjust the PWM of the LEDs to restore the LEDs to the desired resultant color.

REFERENCES:
patent: 4298869 (1981-11-01), Okuno
patent: 6150774 (2000-11-01), Mueller et al.
patent: 6720745 (2004-04-01), Lys et al.
patent: 2001/0028227 (2001-10-01), Lys et al.

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