The Ultra Sun? Metal Halide (MH) Blue Enhanced Performance lamps offer extra emphasis in the blue and violet spectrums with Kelvin temperatures of 7,500ø K and 10,000ø K. This line of Ultra Sun? lamps is 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. Ultra Sun? lamps are high quality, feature robust construction and have excellent reliability at an economical price.