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2. Light tube - Wikipedia

   en.wikipedia.org/wiki/Light_tube

   Light transmission efficiency is greatest if the tube is short and straight. In longer, angled, or flexible tubes, part of the light intensity is lost. To minimize losses, a high reflectivity of the tube lining is crucial; manufacturers claim reflectivities of their materials, in the visible range, of up to almost 99.5 percent. [10] [11]

3. Counter-beam lighting - Wikipedia

   en.wikipedia.org/wiki/Counter-beam_lighting

   Light beam from road tunnel fixture inclined towards approaching vehicle such that contrast is enhanced of obstacle on road. Counter-beam lighting (German: Gegenstrahlbeleuchtung) is a type of road lighting used mainly in road tunnels, providing best visibility of obstacles on the lane, and thus traffic safety, while reducing light-energy cost.

4. VELUX - Wikipedia

   en.wikipedia.org/wiki/VELUX

   VELUX is a Danish manufacturing company that specialises in roof windows, skylights, sun tunnels and related accessories. The company is headquartered in Hørsholm, Denmark and is a part of VKR Holding A/S. VELUX Group is a founding partner of the global Active House Alliance.

5. Mysterious purple light in California sky is no UFO. It’s ...

   www.aol.com/news/mysterious-purple-light...

   Area residents first spotted the purple light in the sky after the Kings picked up their first win of the season against the Miami Heat on Oct. 29. They saw it for the second time following a road ...

6. Daylighting (architecture) - Wikipedia

   en.wikipedia.org/wiki/Daylighting_(architecture)

   The human eye's response to light is non-linear, so a more even distribution of the same amount of light makes a room appear brighter. The source of all daylight is the Sun. The proportion of direct to diffuse light impacts the amount and quality of daylight. [1] "Direct sunlight" reaches a site without being scattered within Earth's atmosphere.

7. Eisenhower Tunnel - Wikipedia

   en.wikipedia.org/wiki/Eisenhower_Tunnel

   In 2007, the tunnel was retrofitted with lower-profile lighting and signs, increasing its clearance by 5 in (13 cm) to 13 ft 11 in (4.24 m). [5] A height detector near each tunnel entrance sounds a siren and turns traffic signals red, stopping all traffic, if an overheight vehicle attempts to enter the tunnel.