I have now purchased three of these units. I have purchased repacement lightbulbs, thinking that was the problem at first. These units work fine for the first two or three months...or if you are lucky, maybe 6 to 8 months. Then the lightbulb goes out. The fan works, but the lightbulb fails. I purchased new lightbulbs. (Not an easy to replace bulb, either, and pricey I might add!) But that's not it. Open the unit up, and there is way more complexity than should be required to fix a lightbulb! The failure is apparently in a circuit board (a circuit board? in a mosquito trap that is basically a lightbulb and a fan?!!!) that is integral to the unit. This is planned obsolesence at its finest. Don't aggravate yourself. Let this one go without purchasing it. You will regret it.