Definitions for "Ballast factor"
Keywords:  lumen, lamp, fluorescent, ansi, output
A light loss factor that must be applied to lumen calculations for fluorescent lamps. It is the ratio of actual lumen output of a lamp operating with a commercial ballast to the rated lumen output operating with a laboratory reference ballast.
associated with fluorescent ballasts.
The ratio of lamp lumen output on a particular ballast as compared to that lamp's (lamps') rated lumen output on a reference ballast under ANSI test conditions (free, unmoving air at 25° C)