650-660nm (red) & 450-460nm (blue) perfect for growth. The majority of the lights I would recommend to be 650-660nm (red). I would say for every 4 red you should have 1 blue. If your building a panel with more than 50 leds put 3 650-660nm, 1 630nm (little lighter red), 1 450-460nm. Its a good...