Lumi black 600w dimmable ballast New electronic, dimmable 600w ballast from the Lumii Black range. High quality and very affordable, it's discreet and packs a massive punch. Firing out a steady light output of 600w and dimmable to 250w for when them temps are too much to handle, it even has a boost function when you want to give your plants that little bit extra lighting power. This is a great ballast, that's solid and at a great price, you wont be disappointed. Part of the Lumii Black Range Dimmable from 250w to 600w BOOST Electronic Ballast Connects to any 600w lamp