Maxibright Daylight 315 is a digital ballast that's been specially designed to work alongside the Philips 315w Elite halide lamps. When using the Daylight 315 with the Philips CDM lamps you will see brilliant results regarding the amount of power consumed, have healthy plants and abundant yields. This kit comes with the Maxibright Daylight 315w digital ballast, single Daylight Reflector and either the Philips MasterColour Daylight CDM or a Philips GreenPower Elite Agro CDM grow lamp.