[Canadian Man]

Hi Alan.
Well if you are planning on using 48" tubes than you have two options.
If you wire 1 bulb per ballast (ment for 4 bulbs) than you will get ~80w per bulb.
If you wire 2 bulbs per ballast (ment for 4 bulbs)
you will get ~ 50 w per bulb.

Kim is running 4 bulbs at 2x per bulb and it is BRIGHT
I am now running 7 bulbs at 4x each(added another one few days ago).
hope this helps
i can mail you wiring diagrams when i get home tonight if you want.