I have a large array of LEDs that I need to be true to their datasheet light frequency emission (ex 635 nm.) The LEDs require Vtyp @ 20 mA ranging from 2.2 V to 1.2 V. Some are within 0.1 V of each other.
In the interest of minimizing the number of Zener power circuits I need to add, could I put both a 1.8 V and 1.9 V on a 1.8 V power source without much light frequency deviation? Any way to know how much or guess the direction of the deviation?
I just remember from past experience that over-volting orange LEDs color-shifted them to yellow. I never knew if this was a bandgap/voltage thing or just overheating LED caused it.