I change this bulb every 2 or 3 years, the light doesn't come on for a long time. The kit included a 200 watt light bulb which is hard to find. I chose 150 watts. There seems to be as much light as 200 watts. Two 150 watt bulbs were cheaper than one 200 watt bulb if you can find one. I've had it in the mount for about a month with no problems.
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