On Friday, April 13, 2018 at 8:27:35 AM UTC-7, Jens Boos wrote:
> Is there a datasheet for this LED? I am really interested in the current 
> draw. (The voltage is fixed, more or less, by the wavelength. So the 
> current will tell us something about the efficiency.) Jens
Google "GaAs LED  efficiency".  According to 
https://www.ele.uva.es/~pedro/optoele/LEDs/Bright_LEDs.pdf , before 1973 
the efficiency was  under 1% or under 0.2%, depending on the chemistry.

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