we have 2 Red LEDs for weapon & drive power active and 2 cool ultra bright blue LEDs for each weapon function. When upsidedown you can see the glow off the arena floor and they only take 20mA. I think they were around £0.30 each from Farnell. Dont forget the resistor though, very important and for 24V it will be more than a standard 1/4 Watt.