Ceramic Metal Halide grow lamp 315W 3K MaxPar CMH lamps are broad spectrum “white” light lamps. CMH lamp technology is broad-spectrum based. A CMH lamp has 2.5 times the blue light of an HPS lamp. The 13.4% blue light from CMH lamps is slightly higher than a 50/50 mix of HPS and MH lamps. A CMH lamp has a far more uniform spectral output than any other lamp used in horticultural lighting. CMH lamps are suitable for cloning, flowering, and vegetative growth. MaxPar CMH lamps should be considered a valuable component in any lighting setup.