List,

LED output is spec'ed in mcd; IRED output is spec'ed in mW/sr. (I think.)

Can anyone tell me how I can compare the radiant output of a LED to an IRED?

I am using a phototransistor as a detector. From it's point of view, it 
won't care if the radiation is visible or invisible; it can detect either.

Red LEDs would be acceptable in my application, but the invisibility of 
IREDs would be preferred, if comparable cost and radiant output can be 
obtained.

Thanks,
Mark
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