Fly Catcher Machines combine two attractant phosphors that are fitted with Synergetic UVA - Green lamp and are patented as well. Here are the advantages they provide you with: Compared to the traditional UVA lamps, the Fly Killer Machine catches blow flies, fruit flies and the common house flies 30% faster. It is more effective than UVA light in attracting various insects, including the tobacco beetle. The Green spectral peak has been proven to better attract all varieties of stored product moths such as tropical, warehouse, Mediterranean and Indian meal moth. Tests conducted by the Medical Entomology Centre at Cambridge in 1994 suggest that almost all flies have a propensity of being pulled towards a UVA and Green Light combination.