Human eye more sensitive to cool white after dark? Plus outdoor lighting article.

slmjim · 2019-10-24T14:31:35.000Z

I found this interesting. Other more-experienced members here probably already know this but, it might be new to others.

Apparently, human eyesight shifts in spectral sensitivity after dark.

“As day turns to night and your photopic cone-based vision turns into scotopic, rod-based vision, your sensitivity shifts a little bit blue. And so very blue-rich light at night comes off as really harsh and glaring..."

I also found interesting the whole discussion re: outdoor LED lighting color temp of interest.

https://arstechnica.com/science/2019/10/how-flagstaff-arizona-switched-to-leds-without-giving-astronomers-a-headache/

slmjim

Pavlo · 2019-10-24T15:25:39.000Z

I have always found I can see better with warm white emitters out in the outdoors. Always found cool white to produce alot of glare.

Th558 · 2019-10-24T21:48:29.000Z

Pavlo:

I have always found I can see better with warm white emitters out in the outdoors. Always found cool white to produce alot of glare.

Yh in the UK they’re putting these 6000ish K streets light everywhere and I hate it. I think they’re trying to achieve maximum efficiency but what’s the point if it’s making visibility worse…

Flying_Luminosity · 2019-10-24T21:51:54.000Z

Th558:

Pavlo:

I have always found I can see better with warm white emitters out in the outdoors. Always found cool white to produce alot of glare.

Yh in the UK they’re putting these 6000ish K streets light everywhere and I hate it. I think they’re trying to achieve maximum efficiency but what’s the point if it’s making visibility worse…

I hate it too, just like those bloody cars with angry blue headlights that you just can't get away from each time you venture outside!

Pavlo · 2019-10-24T21:52:32.000Z

Th558:

Pavlo:

I have always found I can see better with warm white emitters out in the outdoors. Always found cool white to produce alot of glare.

Yh in the UK they’re putting these 6000ish K streets light everywhere and I hate it. I think they’re trying to achieve maximum efficiency but what’s the point if it’s making visibility worse…

That sounds horrible. Clearly someone that didn’t do their homework is making the decisions.

Th558 · 2019-10-24T21:55:51.000Z

Pavlo:

Th558:

Pavlo:

I have always found I can see better with warm white emitters out in the outdoors. Always found cool white to produce alot of glare.

Yh in the UK they’re putting these 6000ish K streets light everywhere and I hate it. I think they’re trying to achieve maximum efficiency but what’s the point if it’s making visibility worse…

That sounds horrible. Clearly someone that didn’t do their homework is making the decisions.

I got a solution though…One by one climb up every lamp post and stick a filter on it. lol.

Flying_Luminosity · 2019-10-24T22:10:28.000Z

A Laser Can Turn Off Streetlights That Interfere With Your Astrophotography

RobertB · 2019-10-25T00:03:17.000Z

My neighbor doesn’t get it, and thinks only of himself. He installed 6000k+ super bright outdoor floodlights that light up the whole corner of the neighborhood like a baseball stadium. In fact, driving down the street towards his house, it looks like someone coming at you with their highbeams on. Trying to think of how to be diplomatic enough to get him to either shut them off, re-aim, and install much warmer bulbs.

Those cheap Home Depot outdoor flood lights should be illegal. What a light pollution cancer they’ve become.

riffraff · 2019-10-25T13:48:22.000Z

Huh. Came here to post this arstechnica article. You beat me to it! Cheers!

snakebite · 2019-10-28T16:24:43.000Z

just wait a while.
those cheap cob floodlights have horrible lumen depreciation and failure rates.
they wont last long.

RobertB:

My neighbor doesn’t get it, and thinks only of himself. He installed 6000k+ super bright outdoor floodlights that light up the whole corner of the neighborhood like a baseball stadium. In fact, driving down the street towards his house, it looks like someone coming at you with their highbeams on. Trying to think of how to be diplomatic enough to get him to either shut them off, re-aim, and install much warmer bulbs.

Those cheap Home Depot outdoor flood lights should be illegal. What a light pollution cancer they’ve become.