ballast resistor

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ballast resistor

[′bal·əst ri′sis·tər]
A resistor that increases in resistance as current through it increases, and decreases in resistance as current decreases. Also known as barretter (British usage).
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Ballast resistor

A resistor that has the property of increasing in resistance as current flowing through it increases, and decreasing in resistance as current decreases. Therefore the ballast resistor tends to maintain a constant current flowing through it, despite variations in applied voltage or changes in the rest of the circuit.

The ballast action is obtained by using resistive material that increases in resistance as temperature increases. Any increase in current then causes an increase in temperature, which results in an increase in resistance and reduces the current. Ballast resistors may be wire-wound resistors. Other types, also called ballast tubes, are usually mounted in an evacuated envelope to reduce heat radiation.

Ballast resistors have been used to compensate for variations in line voltage, as in some automotive ignition systems, or to compensate for negative volt-ampere characteristics of other devices, such as fluorescent lamps and other vapor lamps.

McGraw-Hill Concise Encyclopedia of Engineering. © 2002 by The McGraw-Hill Companies, Inc.
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To do that, one of three lamps in each lighting fixture was disconnected, resulting in the need to use only one of the two electrical ballasts (also known as control gears) in each fixture.
Dali is a digital protocol for the controlling of lighting, such as electrical ballasts and dimmers.