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A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z   entire Web this site ballast A device used to start and thereafter control the voltage (or regulate the current) in a fluorescent lamp. The ballast efficacy factor, a measure of the efficiency of fluorescent lamp ballasts, is the relative light output divided by the power input. The ballast factor is the ratio of light output of a fluorescent lamp operated on a ballast to the light output of a lamp operated on a standard or reference ballast. Related categories    • LIGHTING TOPICS Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP