The model DFL5252 is a UV light specifically designed for fluorescent applications where you want the maximum LW350 UV wavelength in one light assembly. DFL5252 stands for Dual Filter Long wave with two LW350 lamps. The DFL5252 has two lamps (bulbs) each with a peak output at about 352 nm and a LW UV filter (in two sections). Each lamp can be turned “on” and “off” independently. There are 13 different models of Dual TripleBright 3s available depending on which lamp and UV filter combination are used, not all models are listed in the web site. For more information please call or email.