Doctors issue warning over LED streetlights

Mar 2012
56,188
37,757
New Hampshire
#1
The American Medical Association (AMA) has just adopted an official policy statement about street lighting: cool it and dim it.

"The statement, adopted unanimously at the AMA's annual meeting in Chicago on June 14, comes in response to the rise of new LED street lighting sweeping the country. An AMA committee issued guidelines on how communities can choose LED streetlights to "minimize potential harmful human health and environmental effects."

"The new "white" LED street lighting which is rapidly being retrofitted in cities throughout the country has two problems, according to the AMA. The first is discomfort and glare. Because LED light is so concentrated and has high blue content, it can cause severe glare, resulting in pupillary constriction in the eyes. Blue light scatters more in the human eye than the longer wavelengths of yellow and red, and sufficient levels can damage the retina. This can cause problems seeing clearly for safe driving or walking at night. You can sense this easily if you look directly into one of the control lights on your new washing machine or other appliance: it is very difficult to do because it hurts. Street lighting can have this same effect, especially if its blue content is high and there is not appropriate shielding."

The other issue addressed by the AMA statement is the impact on human circadian rhythmicity. Bright electric lighting can also adversely affect wildlife by, for example, disturbing migratory patterns of birds and some aquatic animals which nest on shore.

LED streetlights: Doctors issue warning - CNN.com
 
Likes: 3 people
Jul 2013
54,806
59,025
Nashville, TN
#4
When I was a kid, streetlights were just regular old incandescent bulbs. Then they came out with a greenish bulb, then an orangish bulb and now these bluish bulbs. And they kept getting brighter and more efficient. Now they are too bright and are screwing up the environmental balance...
 
Likes: 3 people
Mar 2012
56,188
37,757
New Hampshire
#5
When I was a kid, streetlights were just regular old incandescent bulbs. Then they came out with a greenish bulb, then an orangish bulb and now these bluish bulbs. And they kept getting brighter and more efficient. Now they are too bright and are screwing up the environmental balance...
Have seen several observatories complain they cause so much light pollution that it interferes with their work. Also astronauts say light pollution is now way worse.

LEDs are changing the way cities look from space - Tech Insider
 
Likes: 2 people
Sep 2011
24,999
17,443
aMEEErica
#9
A slight touch of blue can make whites seem brighter, almost like ultra-white as opposed to a more cream-colored white.

Back in the day, LEDs came in two colors: red and green with others being added in over time, but there were no blue LEDs.. they couldn't get an LED to make that color, and that's also one of the things that kept LED TVs from being developed, they didn't have a blue component to LED light.

And they did solve that problem as we are seeing now.

How do they remedy this problem with the street lights?

Cut down on the blue component and try and provide a more natural yellow light, they need LEDs made specifically for street lights.

Thx :)
 
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Likes: 2 people
Mar 2012
56,188
37,757
New Hampshire
#10
A slight touch of blue can make whites seem brighter, almost like ultra-white as opposed to a more eggshell white.

Back in the day, LEDs came in two colors: red and green with others being added in over time, but there were no blue LEDs.. they couldn't get an LED to make that color, and that's also one of the things that kept LED TVs from being developed, they didn't have a blue component to LED light.

And they did solve that problem as we are seeing now.

How do they remedy this problem with the street lights?

Cut down on the blue component and try and provide a more natural yellow light.

Thx :)
Seem to recall a reason why they went towards blue light but I cant remember why.
 
Likes: 1 person