Is it possible to give LEDs varying current, without sacrificing efficiency? Basically I have 4 LEDs which could all use varying current, because they are different distances from the receivers. The top LED doesnt need to be as bright as the bottom LED, since it is much closer to the photodiode.
I expected that I would be able to get away with less power, since I could more finely tune the current going to each LED, but it seemed to require more power to work as well as the first circuit did. Is my thinking on this wrong?