The Ultra Sun? Metal Halide (MH) Blue Enhanced Performance lamps offer extra emphasis in the blue and violet spectrums with Kelvin temperatures of 7,500?K and 10,000?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.