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I bought some 200mW, 850nm IR LED's Answered

I got them for a project and have been testing with them. So far I haven't been able make them product light with a AA battery. If anyone know what i can do to try to fix this please comment.

PS. I was using a digital camera to check if it was emitting light.



1, what is their specification? They will have a specific forward voltage required to drive them

2. You will/may need a resistor to limit te current flow.

As per this site http://led.linear1.org/1led.wiz

+1. 200mA seems like a lot of draw for a single 5mm led (per the picture). If those are 10mm leds, then 200 is acceptable but probably more than the standard 1.2v for an IR led.

his question actually says 200mW (S)He may have got that wrong though

Thanks everyone i think i have it working now. :D

Agreed. Definitely depends on the purpose of the led - the human eye detects most light sources as 'the same' after a brief adjustment from our iris... So yes, it can really help to run leds a lot dimmer than spec for a multitude of reasons. When it comes to needing an actual amount of light for a process or safety - go with spec :)


7 years ago

NICE. characteristic curve, lol, like in school atp