The Spectralux® Metal Halide (MH) Blue Enhanced Performance lamps offer extra emphasis in the blue spectrums with Kelvin temperature of 7,500°K. Stimulates plant foliage growth and tighter internodal spacing during vegetative growth. These lamps have been specifically engineered for horticulture applications and to be compatible with both magnetic and electronic ballasts. Spectralux® lamps are optimized for use with Sun System® brand ballasts and reflectors. The Spectralux® lamps are high quality, feature robust construction and have excellent reliability. Universal burn position.