The power source is the existing board power source. I want it to turn on when the controller turns on. No external power source. There is a point i can solder to which gives power from the battery while the controller is turned on without being in the same circuit as any other components.
My worry is that if I wire them in parallel, they will have differing resistances causing the one with the least resistance to power mostly and the others to not have the current they should.
If I use separate resistors on each LED, I should be able to get the resistances pretty equal for all 4, but then is that going to make the light un-even since they all put out different light at different power?
And yes i've seen those calculators, but the problem is that they assume the LED's will all be the same, While different color LED's have different voltage drops, foward voltage, and current requirements.