The bulb is nice and bright which I was concerned with. The only issue is that the bulb is larger than a typical bulb so if you dont have a wide opening in your light fixture you may need to unscrew the bottom part of the fixture like I did. Not sure how easy it will be for mosquito's to fly up into the light fixture and get zapped either since the bulb takes up alot of the opening at the bottom. I've had just the zapper part on a couple of times but have yet to hear any zapping I might need to try it with the bulb and zapper on at the same time. I will try the 2nd one in the backyard as there are more mosquito's there.