Hi-LuxGro MH 1000 Watt DE 5500? K delivers color temperature similar to daylight. High blue light ratio and full spectrum output for healthy plant growth and robustness. Superior ?mol output within the PAR spectral range (photosynthesis active radiation). The 1000 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.