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4 lamp rapid start to 4 lamp electronic instant start retrofit wiring diagrams notes this is applicable for 4 lamp t12 rapid start fixture with two 2 lamp ballasts to retrofit to one 4 lamp electronic t8 instant start system disconnect power to lighting fixture prior to servicing the fixture 4 lamp rapid start wiring. With a two lamp series ballast if one lamp fails the other lamp connected to that ballast will not light 4 lamp fixtures containing series ballasts will usually use two 2 lamp series ballasts see diagram below 4 lamp fixtures containing ho high output lamps use one 4 lamp ho ballast diagram not shown. 4 lamp t8 ballast wiring diagram 4 lamp rapid start to retrofit wiring diagrams 4 lamp retrofit wiring diagrams ballasts to retrofit to one 4 lamp electronic t8 instant start ballast blue black white line lamp lamplamp red yellow blue 4 light t8 ballast wiring diagram circuit diagram maker 4 light t8 ballast wiring diagram further 2014 new hot . Visit the post for more amazing t8 4 bulb ballast wiring diagram and awesome lamp fluorescent light wiring diagram medium size of twin tube 4 lamp 2 4 lamp 2 ballast wiring diagram elegant trending 400w hps 4 lamp ballast wiring diagram basic electronics t8 socket