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PowerPlant lamps are tailored to promote optimum development at each stage of plant growth. The PowerPlant arc tube dosing technology achieves more usable light energy without sacrificing intensity or lamp life. The output of Metal Halide is firmly in the blue spectrum, Metal Halide Lamps 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.