does it say ANSI followed by a number anyehere?
socialistpete Reviewed by socialistpete on . help with this ballast please i have this old ballast, i'm not sure if it's mh or hps, the guy i got it from said he thought maybe it was a mercury vapor, i'm hoping not though... it's a white box with a big loop bold coming out of one side and a large socket coming out of the other, i took it apart and can see that it was originally 277v, but it has wires to switch to 208 and 120v. someone has already rewired it for 120. there's a sticker on the inside saying hpf, 400w, it also says ruud lighting. i'll upload pics soon as Rating: 5