This is the percentage of a lamp's rated lumen output that can be expected when operated on a specific, commercially available ballast.
the ratio of light output of a lamp operated by a given ballast to the light output of the same lamp when operated by a reference ballast. Lamps operated by a ballast with BF of 0.90 will provide 90 percent of their rated light output (lumens). BFs between 0.85 and 1.0 are the most common.
The ballast factor (BF) for a specific lamp-ballast combination represents the percentage of the rated lamp lumens that will be produced by the combination.
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.
Relative light output as compared to a reference ballast (i.e. BF of 0.90 would yield 90% of a lamp's rated lumens. The measured ability of a particular ballast to produce light from the lamp(s) it powers; ballast factor is derived by dividing the lumen output of a particular lamp/ballast combination by the lumen output of the same lamp(s) on a reference ballast.
The measure of how close actual light output from a lamp-ballast combination compared to the lamps' rated light output is called the ballast factor (ANSI, 1984).
A ratio of the light produced by a lamp operated by a given ballast to the light produced by a lamp operated by reference ballast. Expressed as a percentage. Also called light output. For example, a ballast having a ballast factor of 0.93 will result in the lamp emitting 93% of its rated lumen output.
Over the life of a ballast the efficiency decreases slightly. The ballast factor is a component of the Light Loss factor (see below).