Electrical

I'm planning on using 3 250W Radiums...which apparently makes my choices of ballast very confusing.
As far as reflectors (pendants, in my case) I was initially looking at the LumenBrights, but I was told yesterday by Aquarium Specialty that these do not come with glass shields, and thats a must for me.
So I am now looking at the LumenMax 2s. Does anyone have recommendations here?

As for ballasts, I know that the 250W Radium is only "correctly" driven by an ...