temperature compensated LED driver

[siriustech]

Hi guys:

I'm developing a colorimeter using a LED as a light source. After building my first prototype and testing I've found that I'm getting slight changes in luminous intensity from the LED with changes in ambient temperature. Before I try to develop a temperature compensated LED driver I was wondering if anyone new of any already on the market. If not does anyone have any suggestions for a circuit.

Thanks,

Pete

 

[cbarn24050]

Are you driving your led from a constant current source?

 

[IRstuff]

Wouldn't matter too much, the characteristics of the LED itself change with temperature.

A well-designed instrument uses both thermal stabilized LEDs and current source.

TTFN