ballast

derekleffew

Resident Curmudgeon
Senior Team
Premium Member
1. general. Weights placed at the bottom of a top-heavy object to keep it upright, i.e. a sailing ship's ballast.
2. Lighting. Power supply for an arc or gaseous discharge light source, containing a transformer, inductor, and voltage and current-regulating circuitry. On moving lights, the ballast is inside the upper enclosure; on most followspots and HMI movie lights, the ballast is an external box, connected to the fixture via an umbilical or head cable. More modern ballasts use a switch-mode electronic power supply (SMPS) rather than an inductor to regulate voltage and current to the lamp source.
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Ballast is shown on the ground next to the four-legged, castered stand.
 

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