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.