Yes, the Mantis 1x2 Fly LIght works very well with all types of flying insects, including fruit flies. All you need to do is make sure that there's not a lot of light competition and position 3-6 feet from the floor, especially in an area of high activity. You will need to use multiple lights in larger areas or areas of high insect pressure.
We recommend purchasing the 15 Watt 18" Replacement Bulbs for the Mantis 1X2 Fly Light unit and replacing bulbs once annually.