this post was submitted on 16 Jan 2026
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An investigation shows that light pollution from Vienna's street lighting has been reduced by 75 percent โ€“ thanks to a successful collaboration between the city and science.

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[โ€“] bob_lemon@feddit.org 11 points 1 day ago (1 children)

Vienna's switch to LED street lighting directs light specifically onto streets and paths, reducing light pollution.

The old streetlights were often quite non-directional. So you'd have illuminated bushes or walls next to the street, which is unnecessary. The new lamps simply have better directionality, creating light only where needed.

[โ€“] j5906@feddit.org 2 points 1 day ago (1 children)

Let me guess they chose the most cold white light possible, that makes a xenon lamp appear warm, instead of the comfortable sodium vapour ones...

[โ€“] Melchior@feddit.org 4 points 1 day ago* (last edited 1 day ago) (1 children)

No they did not, they went for a similar color for the car parts of the street and actually a warmer tone for the cycling and pedestrian parts. That btw also reduces light pollution, as the white ones are much brighter then redish tones.

[โ€“] qupada@fedia.io 1 points 23 hours ago

The large dark sky reserve here in NZ uses 2000K LEDs for all street lighting.

I can't find an article detailing the streetlights they use. Like you've noted, and the bollard pictured in that article, they're designed to spill zero light above horizontal.