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An occulting light means that some of the time the light is shut off, and at others it isn't.

Snaefell Jokul—White occulting light withdrawn for winter.

Have you ever heard of an occulting light?”

Rather more than a mile out is a cluster of islets, on one of which, Carn Brâs, stands the Longships lighthouse, built in 1883 to replace one that had been privately erected; it has an occulting light of over seven hundred candle-power, visible at 16 miles.

The Capella, moving at a rate equal to that of the tide, kept about half a mile from the Isle of Wight shore, with the white, occulting light of the Needles just visible to the north of Cliff End Fort.