The Osram Powerstar Metal Halide lamps offer high efficiency with long life(over 12,000 hrs) giving growers a reliable, proven source of blue spectrum (5100K) light. They are used almost exclusively for aiding superior vegetative growth. Suited to a two-lamp method, these will produce amazing returns when you have a sodium lamp taking care of the flowering stage. Its important to note that halide, high intensity light, lamps can give off high levels of light and heat.
The lamps have a standard E40 screw base for simple handling and a UV coating filter to ensure they fall significantly below the maximum permitted threshold.