I recently had to have my lighting scene controller repaired by Futronix, who advised me that not all GU10 halogen bulbs are the same and when they blow, they regularly kill all types of dimmers, including expensive scene controllers! They listed four manufacturers who as members of LIF, include optional fuses inside the bulbs. I had bought no-name ones off ebay, not knowing some are better than others. I found Argos do a three-pack of Philips GU10 50W's for £5 and noticed B&Q sell GE bulbs if I recall were in 50W, 35W and 20W brightness options, so the recommended ones are not hard to find once we know. I also tried some of the new dimmable white LED GU10's, which dimmed but wouldn't go right off using my Futronix P100 controller, so they went back. Ref: http://www.futronix-info.com/article_halogens_damage.htm Ref: http://www.avforums.com/forums/showpost.php?p=2523520&postcount=23 regards, Rob.