I took mine apart and wired the sun system pig tail on so I can use other reflectors and use the ballast remotely. It's pretty easy to take them apart and wire them up the way I did mine. You can also buy the little female receptacle inputs for your 110 or 220 power that way you can use the same cords that come with horticulture type ballasts. But one thing you wanna make sure of before you buy them is if they're multi tap. Multi taps can be wired for 120, 208, 220, 277, and 480v. But if it's a single tap then 277 is all that'll work and most folks just have 110/120v or 220/240v so make sure of that it's very important. Idk how much they selling for but if you look around you should be able to score these really cheap(scrap price) because most big factories are taking these down and replacing with LEDs for a huge power savings for them as most factories have hundreds of these lighting those huge industrial buildings.Thanks BB. Saw them for sale so haven't picked em up. Do you think they'll get hot in the tent with the ballast attached? And $70 for 3 bulbs on eBay is nice. I want to stay 3100k so if 315s will work then I might take a chance. They also look really heavy.