What fire hazard exactly? Nothing is hooked through extension cords. My lights and AC are on separate circuits. The only problem is my ac isnt programmed to turn back on after the power goes out. The power surges arn't a common problem. But power surges do happen every once in awhile. Has only happened once since I've started(about 2-3 months, but the room hit temps in the 104 degree range before I caught it. Most of the plants showed some signs of heat stress, and the ones under the HID were hit pretty hard. Thanks for the link chris.