GMSgrowsanswered grow question 3 years ago Inside the socket at the bottom is a metal tab that can get pushed in if you over tighten your bulb. When you hit the reflector the bulb moves slightly and loses the connection so it shorts. You can try pulling the tab back out if you can. If you have an old bulb you can try to see if you resolved the problem. If not, then you need new sockets.