With 2,200 µmol/s in total output and 1,900 µmol/s in the key wavelengths between 400-700 nm, the 1,000-watt SUNMASTER SUPER HPS HO lamp offers up to 20 percent more µmol/s and over 47 percent more red to far-red energy compared to other 1,000-watt single-ended HPS lamps. This impressive orange-red spectral output encourages earlier flowering and increases the total number of branches, internodes and flowers. Suggested operation on electronic ballast. One-year warranty.