You have to have the ballast in order for a HPS or MH light to work. There are kits you can buy to build your own system. They're pretty easy to put together.
killerweed420 Reviewed by killerweed420 on . Can a HPS lightbulb be used in any light fixture? I would like to keep my costs low, and so if possible I would like to buy an HPS lightbulb, without buying the whole fixture. Is it alright to just stick it in a regular light fixture like a lamp or something? Rating: 5