If you are paranoid about buying from a HYRDROPONICS STORE, or using the internet, try to find a local electrical supply outlet. Many out door floodlights are hps, or metal halide. Both are great for growing, these flood lights will have a different kind of reflector but they work either way. Many shop lights and arena style lights are hps or metal halide, same with streetlights. There are cheaper, more "average joe" places to get the proper lights. Most of the time this can be a cheaper route also.