China manufacturer of magnetic ballasts for metal halide flood lights & hps flood lights

fluorescent electronic ballasts installed
Description: fluorescent lamps both ends of the four lines, as well as electronic ballasts (induction lamp ballast) on the L, N how to pick?

L pick the FireWire, N zero line. There are four lines are divided into two groups, the four lines have a difference. Two a group of the same color, or from relatively close. Can distinguish. The two lines of each group received the same end of the fluorescent lamp, and the other two connected to the other end.