These Spectralux® Metal Halide (MH) universal burn position lamps are Blue Enhanced Performance lamps. The lamps offer an extra emphasis in the blue and violet spectrums with Kelvin temperature of 10,000°K. This line of Spectralux® lamps are exceptional for vegetative growth and for the final fruiting and flowering stages of a plant's development. 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.