3 ms·

Does no one produce and high intensity 2700K LED light for street illumination purposes? It seems like this would be an obvious and easy solution.

scythe 8y ago
The whole point of the LED was that the white color provides better vision at lower luminosity. If you make it yellow, there's no advantage over sodium vapor lamps which are already very efficient.
- ScottBurson 8y ago
  They would still have a much broader spectrum. Sodium vapor lights are very unnatural [0] — I certainly wouldn't describe them as "cozy" and "more human", as the author does. Plus, the low-pressure ones are difficult to distinguish from a yellow traffic light. [0] https://en.wikipedia.org/wiki/Sodium-vapor_lamp https://en.wikipedia.org/wiki/Sodium-vapor_lamp
  - DenisM 8y ago
    I concur - I own a couple of 2300k LED lights and the light the give off is very cozy, nothing like the streetlamp.
- TheSpiceIsLife 8y ago
  I see, thanks.
p1mrx 8y ago
My HOA is currently researching LED lights for our parking structures. These are the best high-intensity not-blue (3000K) candidates we've found so far: http://www.westgatemfg.com/lighting/led-outdoor-lighting/led-wall-packs.html http://www.westgatemfg.com/lighting/led-outdoor-lighting/led... The same company also makes streetlight-style LEDs, but they're all 5000K, so that's not very promising.
antoineMoPa 8y ago
Actually, some businesses offer these [1]: This seems like a good way to save both sleep & energy while preserving a good visibility. According to the page, the CRI (color rendition index) of their warm LEDs is better than conventional HPS lamps. This means that you can actually distinguish objects better with it. I have also heard of someone who patented a filter for LED lamps, but I don't know how far he got with that. In my city, we have some of these filtered LEDs installed and it feels more pleasant than any white/blue LED streetlights I've seen. [1] http://www.cree.com/news-media/news/article/next-generation-of-groundbreaking-rsw-led-street-light-portfolio http://www.cree.com/news-media/news/article/next-generation-...

scythe 8y ago

The whole point of the LED was that the white color provides better vision at lower luminosity. If you make it yellow, there's no advantage over sodium vapor lamps which are already very efficient.

ScottBurson 8y ago
They would still have a much broader spectrum. Sodium vapor lights are very unnatural [0] — I certainly wouldn't describe them as "cozy" and "more human", as the author does. Plus, the low-pressure ones are difficult to distinguish from a yellow traffic light. [0] https://en.wikipedia.org/wiki/Sodium-vapor_lamp https://en.wikipedia.org/wiki/Sodium-vapor_lamp
- DenisM 8y ago
  I concur - I own a couple of 2300k LED lights and the light the give off is very cozy, nothing like the streetlamp.
TheSpiceIsLife 8y ago
I see, thanks.

p1mrx 8y ago

My HOA is currently researching LED lights for our parking structures. These are the best high-intensity not-blue (3000K) candidates we've found so far: http://www.westgatemfg.com/lighting/led-outdoor-lighting/led-wall-packs.html http://www.westgatemfg.com/lighting/led-outdoor-lighting/led... The same company also makes streetlight-style LEDs, but they're all 5000K, so that's not very promising.

antoineMoPa 8y ago

Actually, some businesses offer these [1]: This seems like a good way to save both sleep & energy while preserving a good visibility. According to the page, the CRI (color rendition index) of their warm LEDs is better than conventional HPS lamps. This means that you can actually distinguish objects better with it. I have also heard of someone who patented a filter for LED lamps, but I don't know how far he got with that. In my city, we have some of these filtered LEDs installed and it feels more pleasant than any white/blue LED streetlights I've seen. [1] http://www.cree.com/news-media/news/article/next-generation-of-groundbreaking-rsw-led-street-light-portfolio http://www.cree.com/news-media/news/article/next-generation-...