Catsnap

Uneven Brightness

Uneven Brightness

The yellow LEDs are considerably dimmer than the red and orange ones. My first backlighting circuit had all the LEDs in parallel, with a single resistor cluster. It turns out that's incorrect: the various colors have different electrical characteristics and the brightness ends up uneven.

Notice that the breadboarded LEDs, which have a separate set of resistors for each color, are evenly bright.