Good advice^^^^

You know a capacitor will store a charge and can still give you a lethal shock even if it's "unplugged," right?

Buy a commercially produced ballast. If you want to you can always sell it later (which you can't easily do with a homebrew stuff).

This is not the type of equipment to learn on.

Stay safe,

AC/DC Hermie
DreadedHermie Reviewed by DreadedHermie on . help with setting up HPS light and ballast idk if i can post a link to the site so il just post the specs and a picture. Manufacturer Sola Manufacturer's Part # E-971-WDD-S0400 Voltage 120 / 208 / 240 / 277 (Quad) ANSI Code S51 Height 4.25 in. Over all Length (M.O.L) 4.75 in. Width 4.0 in. Operates 400 Watt Lamps Rating: 5