Vault light

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a partly glazed plate inserted in a pavement or ceiling to admit light to a vault below.

See also: Vault

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
2 The Battenfeld Lockdown Vault Lights solves the problem of having to fumble around in a dark safe.
At the base of the bar, LED nodes housed beneath antique glass vault lights illuminate the bar fascia, or front surface of the bar.
On display at the New York Transit Museum, the "Centennial Celebration" exhibit includes recently renovated vault lights from City Hall and the silver-bladed ceremonial shovel used to break ground for the subway in 1900.