you want a separate ballast from the light fixture for horticulture purposes...those commercial lights are for warehouses & factories

I wouldn't bring into my house if they were free
Dutch Pimp Reviewed by Dutch Pimp on . Mercury Vapor and HPS Lighting Hey All! I was wondering if a mercury vapor light that says M59 and 4H33 on it is basically stating it is compatible with Metal Halide and HPS bulbs? This may be a rudimentary question, but I am just learning about lighting. I have been using fluoros, and have decided to make the switch to HPS for a primary lighting. I just received an offer from a guy to buy a couple HPS (so he says) lights for around 40 bucks. The only catch is that I will have to splice on some extra cord to plug Rating: 5