This unique ballast has all the features that are incorporated into our Sun System® 1 fixture, but adds the ability to run either MH or HPS lamps from one ballast. Changing from one lamp type to the other is easy – simply insert the appropriate lamp and set the switch to the correct operating setting. Major brand ballast. Comes standard with an 6’ - 120 volt Smart Volt™ powercord. Purchase the 240 volt Smart Volt™ powercord separately (#903082).