light pipe

noun Optics.
an elongated transparent medium, such as an optical fiber, for transmitting light.

Origin:
1945–50

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Daylighting systems and direct solar light pipe technology.
We have succeeded in coupling both the laser and the probe radiation to the sample via a beam-splitter and light pipe arrangement.
The light pipe is enclosed inside an airtight housing, which provides mechanical support and protection from the fire environment.
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