Hydro Crunch 315-Watt 4200K CMH bulbs feature superior color quality and very crisp white light. Incredibly high PPF (photosynthetic photon flux) per watt per second light source. Low heat generated and enhanced lifespan. Hydro Crunch 315-Watt Ceramic Metal Halide CMH to Mogul Base Socket Adapter for 315-Watt CMH lamps to fit into standard 250-Watt to 1000 Watt mogul sockets. Initial lumens at rated watts after 100-hours of operation is 33000Lumens. Rated average life 15,000 hrs. Temperature Color 4200K. 98 CRI (Color Rendering Index). PAR Value: 540 umol/s. 1-year warranty.