with an hps lamp, you always need a ballast...if you don't want the hassle of using a ballast and dealing with heat, try an induction lamp...50 watt induction lamps are rated to be the equivalent of 150 watt hps. they run cooler and 90% of the light is in the PAR range, as opposed to about 10% with HIDs.
with an hps lamp, you always need a ballast...if you don't want the hassle of using a ballast and dealing with heat, try an induction lamp...50 watt induction lamps are rated to be the equivalent of 150 watt hps. they run cooler and 90% of the light is in the PAR range, as opposed to about 10% with HIDs.