
1) Water stream
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https://www.crosswordclues.com/clue/daylighting

Daylighting is the practice of placing windows or other openings and reflective surfaces so that during the day natural light provides effective internal lighting. Particular attention is given to daylighting while designing a building when the aim is to maximize visual comfort or to reduce energy use. Energy savings can be achieved either from th...
Found on
http://en.wikipedia.org/wiki/Daylighting
[tunnels] Daylighting a tunnel is to remove its `roof` or overlying rock and soil, thus exposing the railway or roadway to daylight. This could also be seen as converting the tunnel to a railway or roadway cut. Tunnels are often daylighted to improve vertical or horizontal clearances, for example to accommodate double-stack container trains...
Found on
http://en.wikipedia.org/wiki/Daylighting_(tunnels)

The use of windows and skylights to provide supplemental lighting, in the form of direct, diffuse, or reflected sunlight, for building interiors. This is an aspect of passive solar energy relevant to every home. Today's highly energy-efficient windows, as well as advances in lighting design, allow ...
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http://www.daviddarling.info/encyclopedia/D/AE_daylighting.html

Daylighting is slang for working on a second job during daylight hours.
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http://www.probertencyclopaedia.com/browse/ZD.HTM

The use of direct, diffuse, or reflected sunlight to provide supplemental lighting for building interiors.
Found on
https://www.encyclo.co.uk/local/22819
No exact match found.