If you search the light you should be able to find some markings from the factory somewhere on it, check the bulb itself very closely and post the numbers/letters and someone on here should be able to give you an answer. You can buy a cheap timer at wal-mart I highly reccomend you do that. If you keep giving them an erratic light pattern you increase the risk of hermies. Oh yeah one more thing about the timer, If you buy the cheap one at wal-mart make sure to check the clips you use for adjustments because they will fall out eventually.