Today one of my MH pendats wasnt lit when I got home. I checked all connections and everything was good, checked the ballast and it was cold. I unplugged it from my power strip and when I plugged it back in the bulb fired, started to go and withing 5second it went off. I waited 15min again to let the ballast chill and plugged it in only to get the same response. These are lumenarc pendants with reeflux 20k bulbs that are maybe 3-4months old. Does it sound like the bulb or the ballast? The ballast is a little over a year old Ice Cap 250w