4' T8 Fluorescent Program/Rapid Start Ballasts - Choose Ballast Factor

Every fluorescent program start ballast has either a low, normal, or high ballast factor. Low ballast factor uses .77 of the lamp's rated watts, normal ballast factor uses .88 of the lamp's rated watts, while high ballast factor uses 1.15 of the lamp's rated watts.

1-lamp Program Start T8 Ballasts Low Ballast FactorProgram Start Normal Ballast FactorProgram Start High Ballast Factor