https://www.theguardian.com/environment ... SApp_Other
I feel that this needs some discussion. There’s been a massive shift in the last few years to whiter LED street lights. Not sure what can be done at this stage other than more research. Also, is it anything like as significant as insecticide usage?
Light pollution kills insects
Light pollution kills insects
where once I used to scintillate
now I sin till ten past three
now I sin till ten past three
Re: Light pollution kills insects
Our street's lights were changed from high pressure sodium to LEDs a couple of years ago.
The new lights are white, but they are very much dimmer than the old ones, they're better shrouded so all the light shines down (you can barely see them from a distance) and most of them turn off at midnight, leaving just a few odd ones on at road junctions.
The new lights are white, but they are very much dimmer than the old ones, they're better shrouded so all the light shines down (you can barely see them from a distance) and most of them turn off at midnight, leaving just a few odd ones on at road junctions.
Re: Light pollution kills insects
What's interesting it's not even the case that LEDs are more efficient than Sodium lighting (particularly Low pressure) for street lighting.
https://en.wikipedia.org/wiki/Luminous_ ... efficiency
https://en.wikipedia.org/wiki/Luminous_ ... efficiency
My avatar was a scientific result that was later found to be 'mistaken' - I rarely claim to be 100% correct
ETA 5/8/20: I've been advised that the result was correct, it was the initial interpretation that needed to be withdrawn
Meta? I'd say so!
ETA 5/8/20: I've been advised that the result was correct, it was the initial interpretation that needed to be withdrawn
Meta? I'd say so!
Re: Light pollution kills insects
No, but LEDs do have a longer lifetime (~35,000-50,000 compared to ~18,000 for LP sodium) so the lower maintenance/replacement costs would make them more attractive.Gfamily wrote: ↑Mon Nov 25, 2019 11:23 amWhat's interesting it's not even the case that LEDs are more efficient than Sodium lighting (particularly Low pressure) for street lighting.
https://en.wikipedia.org/wiki/Luminous_ ... efficiency
"My interest is in the future, because I'm going to spend the rest of my life there"
Re: Light pollution kills insects
Thanks - I wondered if that was part of the enthusiasm for them.Martin_B wrote: ↑Mon Nov 25, 2019 12:20 pmNo, but LEDs do have a longer lifetime (~35,000-50,000 compared to ~18,000 for LP sodium) so the lower maintenance/replacement costs would make them more attractive.Gfamily wrote: ↑Mon Nov 25, 2019 11:23 amWhat's interesting it's not even the case that LEDs are more efficient than Sodium lighting (particularly Low pressure) for street lighting.
https://en.wikipedia.org/wiki/Luminous_ ... efficiency
Our local conversion has been fairly effective at putting light where its most useful - but I would prefer a slightly deeper baffle around the lights - I think you should only be directly able to see the LEDs in the nearest lamp.
My avatar was a scientific result that was later found to be 'mistaken' - I rarely claim to be 100% correct
ETA 5/8/20: I've been advised that the result was correct, it was the initial interpretation that needed to be withdrawn
Meta? I'd say so!
ETA 5/8/20: I've been advised that the result was correct, it was the initial interpretation that needed to be withdrawn
Meta? I'd say so!
Re: Light pollution kills insects
You need an overlap on one side of the street, so that there's no deep shadows on the other side (or middle) of the street.Gfamily wrote: ↑Mon Nov 25, 2019 12:41 pmThanks - I wondered if that was part of the enthusiasm for them.Martin_B wrote: ↑Mon Nov 25, 2019 12:20 pmNo, but LEDs do have a longer lifetime (~35,000-50,000 compared to ~18,000 for LP sodium) so the lower maintenance/replacement costs would make them more attractive.Gfamily wrote: ↑Mon Nov 25, 2019 11:23 amWhat's interesting it's not even the case that LEDs are more efficient than Sodium lighting (particularly Low pressure) for street lighting.
https://en.wikipedia.org/wiki/Luminous_ ... efficiency
Our local conversion has been fairly effective at putting light where its most useful - but I would prefer a slightly deeper baffle around the lights - I think you should only be directly able to see the LEDs in the nearest lamp.
street lights - before and after.png