315 Watt Maxibright Daylight CDM BallastDigital CDM Ballast Get the very best out of your 315W Philips CDM Lamps say hello to the 315W Maxibright Daylight CDM Digital Ballast. It's the one used in the 315 Watt Maxibright CDM Horizon Lighting System. It's been specifically designed to enhance the light intensity & spectrum output of 315 Watt Philips CDM Lamps. When connected, these lamps emit a smooth beam pattern, thanks to your ballast's excellent frequency control! They'll also kick out