downlight

[doun-lahyt]
noun
a lamp, often a light bulb set in a metal cylinder, mounted on or recessed into the ceiling so that a beam of light is directed downward.

Origin:
down1 + light1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
They were recognized for developing energy-saving convective venting systems for compact fluorescent downlight fixtures.
The high temperatures in a recessed downlight can cause a non-heat-rated ballast to fail prematurely.
It is not recessed into the ceiling if it's a downlight or installed in any other manner that's realistic.
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