All ballasts in this category are safe to use with double ended bulb technology including but not limited to Ushio, Philips, Gavita, Digimax, and other double-ended lamps. For all 400v bulbs (Gavita Pro Plus and Ushio Pro Plus) use a ballast with a 400v input voltage (Gavita Pro 1000w Remote or Phantom 1000w DE Ballast). If you have any questions on double ended ballast and bulb compatibility, please give the Growers House staff a call at 855-289-1441.