Powerplant SuperVeg Metal Halide 400w Bulb
400 Powerplant SuperVeg Metal Halide Bulbs are used for the veg-phase of plant growth. When in vegetative growth plants prefer blue spectrum light which these bulbs put out. For flower plants need red spectrum light which these bulbs do not put out. The benefit of metal-halide lamps is that plants do not stretch as much and instead remain very squat and develop more shoots. Metal halide bulbs run on the same equipment as your main sodium flowering light so all you need to do is swap the bulbs. Just remember that you can only use the same wattage as your sodium light though.
400w Powerplant SuperVeg Metal Halide Bulb will fit any reflector with an E40 lamp holder and require a 250w ballast or powerpack to run.