These LED modules were used in the manufacturing of highway signs. You know they have to be bright, so on-coming traffic can see them in the bright sun-light. The Signs had 288 watertight modules per sign. The clusters come with 6 T1-3/4 high power red LEDs and 10 T1-3/4 high power yellow-green LEDs in the cluster. The red and the yellow-green LEDs can be powered separately. The clusters are powered by 9 to 12 volts and draw 90mA if both sets of LEDs are hooked up. Easily mountable with an M3.0x8.0 screw. The Luminous intensity is 7700+mcd.