Hi Toby Not much.... but you don't need to know much with LEDs - just make sure to connect them the right way round and a standard diode drops 0.7v across it, so connect up 18 of them in series to make 12v. Also try to get some that aren't too directional. Most will state a "viewing angle". We got some sponsorship for the robot from a company called Marl who make super bright LED arrays - about 100 times brighter than a standard LED, and rated at 12 (or in our case 24) volts. www.marl.co.uk Martin #1458 #4426 "Toby Peterson " wrote: > Darryl tells me that brighter > tailights for Winged1 should be my next project. Martin - what do you > know about making LED panels? > > Toby Peterson VIN 2248 > Winged1