Any body have a source for an LED that can be driven by less than 500ua - see link below. I'm not interested in brightness or viewing angle, just that the LED lights up.

http://www.avagotech.com/pages/en/leds/subminiature_lamps/domed-resistor_led_series/hlmp-q156-h0031/

 

I think you need to define a lux per mW level or something like that, that you are seeking. I mean, even a generic LED will make a small amount of light at 0.5mA. I suppose some other LED might be more optimized for very low current but the light output per watt depends on the technology and it's hard to squeeze out more.

 

I think you need to define a lux per mW level or something like that, that you are seeking. I mean, even a generic LED will make a small amount of light at 0.5mA. I suppose some other LED might be more optimized for very low current but the light output per watt depends on the technology and it's hard to squeeze out more.

You are right. I suppose what I meant, are any manufacturers that are specing their leds at less than 501ua? The above is the only one I have have been able to find.
TS AlGaAs technology the led I linked to seems pretty exotic, perhaps there is something even more exotic out there.