> Think a LED flashlight on these things - I'm >considering an array of 15 for a wheelchair headlight with ultra long >life & no chance of vibration breaking the filamnts. You DO need to >keep the lens clean or you'll reduce light output by up to 50%... Don Lancaster did a column a while back where someone makes a 'cavers lamp' using 25 white LEDs - some of 1 beam type, the rest of another. He said that the manufacturer was able to buy the LEDs in sufficient quantity that he could match the foward voltage on all 25 LEDs and connect them in parallel (without ballast resistors) and power the works from a small switcher. Sounds just like what you need! Check back issues of Electronics Today. dwayne Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (403) 489-3199 voice (403) 487-6397 fax