Encyclopedia

ballast factor

Also found in: Acronyms.

ballast factor

[′bal·əst ‚fak·tər]
(electricity)
The ratio of the luminous output of a lamp when operated on a ballast to its luminous output when operated under standardized rating conditions.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

ballast factor

The ratio of the luminous output of a lamp when operated on a ballast to its luminous output when operated under standardized rating conditions.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive
After the university's electrical department reviewed several fixture, lamp and ballast combinations, it selected Columbia Lighting's e-poc luminaire fitted with two T5 lamps and an EnergyMax tuned 1.04 ballast factor ballast.
A lesson in retrofitting
* Keep ballast factor (BF) high enough to provide proper level.
Light right
However, it is true that this process factors out the effect of the ballast factor as the readings are typically normalized to the manufacturer's initial lumen rating of the lamps in a relative photometry report.
Can we trust relative photometry? Absolutely
Issues such as losses due to heat build-up and ballast factor, which further erode the relative photometry numbers, are ignored.
Apps + answers
These methods include dimming, installation of ballasts or LED power supplies with a flexible range of ballast factors, lumen maintenance controls, and settings for both highland low-end trim on the control system's output.
Task tuning demonstrates energy savings potential: a pilot study of commercial buildings examines this localized lighting approach
* Systems versus lamps, including variable ballast factors with high-performance lamps
Bright ideas, on a budget: balancing the need for a well-lit store against rising electricity costs may be the biggest challenge lighting designers face
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