APPARATUS AND METHOD FOR MONITORING LED COLOUR MIX
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United States of America Patent
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Issued Date -
Apr 2, 2015
app pub date -
Apr 29, 2013
filing date -
Apr 30, 2012
priority date (Note) -
Abandoned
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Abstract
An LED assembly (50) includes a plurality of LEDs including a first LED (52, 56, 60) of a first colour and a second LED (54, 58, 62) of a second colour. The assembly also includes a driver (53). The driver (53) includes a monitor (55) for monitoring a response of an LED, the absorption spectrum of which at least partially overlaps the emission spectrum of the first LED, and thereby obtaining an indication of the light output of the first LED. The assembly also includes a current supply (57). The driver (53) is configured to control the current supply to supply current to at least one LED of the plurality of LEDs in dependence upon the indication of the light output of the first LED whereby to maintain a desired colour mix of output light from the LED assembly (50).
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