I am looking at bidding a job that requires retro fitting approx. 300 4 lamp t-12 troughers to t-8. They are half switched fixtures and will again require 2 ballasts as opposed to (1)4 lamp ballast. In looking at the new electronic ballasts the wiring configuration is different. My question is do the wires leading from the tombstones out into the wiring trough have to correspond (color wise) to the ballast leads? I still need to pull the lampholder brkt out of the fixture, but if I can get away without having to pull out the snap in conductor in the tombstone just to change it's color I will. Was told by the sales person supplying the ballasts to the customer that the new ballasts were a direct replacement and that no wiring change was required.The new electronics have 2 fewer leads. Thanks.