lead-lag ballast

lead-lag ballast

[¦lēd ′lag ‚bal·əst]
(electricity)
A ballast for a pair of fluorescent lamps, one operating on leading current and the other on lagging current, to diminish the stroboscopic effect.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

lead-lag ballast

A ballast for two fluorescent lamps, one of which operates on leading current and the other on lagging current; tends to reduce the stroboscopic effect.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.