The L.T.F. DA18W440CBF1 is a 18w 440mA constant current LED driver. It has a voltage range of 27 - 42Vdc and operates on 120Vac. The L.T.F. DA18W440CBF1 does not have bottom stud mounts but does have the leads coming out the bottom and is ELV and Triac dimmable. Also, available is the DE18W440CBF1 277Vac version and the DU18W440CBF1 220-240Vac version.