The only difference with commercial lights from Home Depot is the reflector, HPS is HPS, no difference in light spectrum. The grow shop fixtures isolate the ballast for lighter weight in the bulb reflector part of the light. The reflector in commercial lights focuses the light into a beam so that you can light up a parking lot like a flood light. Grow lights use a reflector that spreads out the light (diffuses the light) so a larger circle is formed not a tight beam. If you have common sense, you can build a reflector from sheet metal and spray the lit side with flat white heat paint for engines etc. One big difference is that you don't have to order it from a grow shop that is probably run by the police or the owners sell your info to the cops for a little extra profit. Where I come from the police don't like people that grow pot in their houses, so the less someone ADVERTISES that they are doing it the more likely they won't get that midnight knock on the door. Wiring is simple, black is hot white is neutral and green is ground. All 3 prong heavy extension cords use this color code, so cut off the end, strip the wires one inch back AND USE WIRE NUTS to connect the wires to your lamp wires. Don't try hooking up HPS without a ballast like an incandescent house bulb, cuz they are totally different by design. You can find real cheap used HPS lights at yard sales, flea markets and in papers that sell used stuff, just replace the bulbs because old bulbs don't give off the same light as new. If Home Depot doesn't have em any electrical supply house has everything you want no questions asked, no cops involved. 20 years and no arrests in a small town where everyone knows your business, I guess I did something careful enough. Just my opinion, that's all