I have a MH fixture that can hang over a small tank. The current light is a 175W bulb and a pretty old ballast but it still fires right up. I do have a brand new Galaxy 150W ballast that could be used with it if you changed the bulb to a 150W. It's 14" L x 10.5" W x 5" H
$50 - for 175W Halide fixture with old Ballast
or
$100 - 175W fixture with Brand New Galaxy 150W electronic Ballast