need help with halides

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ashchad

Aquarium Advice Apprentice
Joined
Sep 14, 2008
Messages
13
hi i just got into halides for my reef tank, and i bought some light bulbs and housings, they are 150 w bulbs and housings.....now the problem that i have is they won't plug into the wall, they have this piece of plastic on the end some one said that i might need a ballast.
if i do what do i need?
here are some pictures, any help would be awesome
 

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