Fluorescent ballast replacement for 48" four bulb fixture

This is how I replace the ballast in a T8 fixture. You can convert a T12 to T8 as well. Fluorescent bulbs are very dangerous if you cut yourself with one so be careful. I am not an electrician, just a DIY person. Shut off the power so you don't electrocute yourself.

http://www.allelectrician.com