I have owned one of these units before and its still working after many years and a few bulb replacements. The bulbs should be replaced yearly for optimum performance. This unit does the job! The 40-watt size doesn't work as well. I started out ordering 2- replacement bulbs for my current unit from Amazon at a total cost of around $36. I ordered the bulbs and then realized that the cost of a new unit INCLUDING BULBS was $55. What a deal. I ordered the new unit and donated the still working old unit. I highly recommend this product. I live in California and the bug problem is not as bad as on the East coast. However, I spend time in my backyard relatively flying insect free.