Philips 315 Watt Master Color Ceramic Metal Halide Bulb, 4,200 KThe Philips Master Color CDM (CMH) Bulb, 315 Watts 4,200 K is one of the best lamps out there for hobby and commercial growers alike. It gives your plants the spectrum of light they need for explosive growth, with a super crisp white light for veg flower growing. In terms of output, spectrum, efficiency, and reliability, this bulb cannot be beat. Here are all the reasons we love this lamp: Benefits Of The Philips Master Color CMH Bulb, 315 Watts