In need of a replacement for your old Hydrofarm ballast, but not interested in their models? No problem! Enjoy the flexibility of upgrading your Hydrofarm light fixture with one of the great ballasts that we offer using this simple socket-to-ballast adapter. The “HYL to Hydrofarm” adapter connects the unique Hydrofarm-type socket plug to the universal-type ballast receptacle. The male end plugs into the universal ballast receptacle, and the female end accepts the Hydrofarm-type socket plug.