For ACL (Aircraft Landing Light) we have a term and definition in Concert Lighting.

A 28 volt very narrow beam PAR lamp (used on aircraft) often adapted for use in PAR64 and PAR46 fixtures. ACLs are commonly wired with 4 lamps in series to bring the required voltage of the circuit close to 120 volts. ACL lamps are typically brighter, more intense, and have a higher color temperature than standard PAR lamps. They typically are more expensive and have a shorter lamp life.
See Also: Automated Fixture
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