Who has retro'd the 12g jbj nanocube with 70w halide lamp? plans?

[Newreeflady]

Looks like i'm getting a deal on a system with dead lamps, so I am probably looking to retro it with a halide fixture. I am wondering who here as done this on the 12g jbj, what lamp/ballast system they used and if they have tips, plans.

Anyone?
thx
-A