The L.T.F. DA20W500C2040-3001 is a 20w 500mA constant current LED driver. It has a voltage range of 20 - 40Vdc and operates on 120Vac. The L.T.F. DA20W500C2040-3001 is also ELV and Triac dimmable. Also, available is the D20W500C2040-3001 277Vac version and the DU20W500C2040-3001 220-240Vac version.