Ushio HiLUX GRO 1,000 Watt Double-Ended (DE) MH Lamp delivers 5,500 degree K color temperature similar to daylight. High blue light ratio and full spectrum output for healthy plant growth and robustness. Superior µmol output within the PAR (photosynthesis active radiation) spectral range. This 1,000 watt DE metal halide lamp holds the highest industry quality ISO 9001 standards with best-in-class reliability over its lifetime. Easy lamp change. Special lamp design optimized for usage in open luminaires.