Match the lamp first: a T8 ballast drives T8 lamps, and a T5HO ballast drives T5HO lamps — they are not interchangeable. Then match the circuit: two-lamp, three-lamp and four-lamp versions exist, and a four-lamp ballast in a two-lamp fixture wastes capacity and may not strike correctly. Input voltage and dimming capability come next.
We stock instant-start, programmed-start and dimming ballasts for T8 and T5 systems, in two-lamp and four-lamp configurations.
