SUNMASTER® Full Nova lamps incorporate rare earth elements like Dysprosium and Thulium within the inner arc tube to broaden the spectrum and emulate natural sunlight, emitting light around 6,000 degrees kelvin. They offer the highest objective measurement of total light energy available, promoting high levels of photosynthesis without compromise. Optimized for use on CMH electronic ballasts only. This 315-watt CMH lamp delivers 32,500 initial lumens and 25,000 hours of life. One-year warranty.