I am not an electrician so bear with me.
Our facility has a large number of ceiling light fixtures with 3 each FT40T12 bulbs. I know that I will soon need to convert these to T8 bulbs and change out the ballasts. My questions:
1) The present fixtures each have 2 ballasts, 1 for a single bulb and 1 for 2 bulbs. Why do the two circuits require different ballasts?
2) Will the new T8 bulbs also require two different ballasts?
3) Will the T8 bulbs work in the older T12 two pin sockets?