Most of the ballasts are OSRAMs (fauna-marin, Aquaconnect, etc), but they are only in 220v, so the best we can do in the US is the Sylvania Quicktronic counterpart, which can be used 110v-277v... NICE. Otherwise, some of the ATI units are using a similar ballast by Vossloh-Schwabe, which can also be used 110v-277v. FWIW, the V-S ballasts look dead identical to the Sylvanias on the outside, and their specs are the same as well. When you look at the details, V-S is part of AROMAT, which is technically part of Panasonic/Matsu****a, so I wouldnt be shocked if the VS and the Sylvanias were identical ballasts.