Ultra Sun MH 1000 10,000K (12/Cs) The Ultra Sun Metal Halide (MH) Blue Enhanced Performance lamps offer extra emphasis in the blue and violet spectrums with Kelvin temperatures of 7,500K and 10,000K 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