missmuffet Posted June 25, 2016 Group: Royal Member Followers: 34 Topic Count: 1,991 Topics Per Day: 0.48 Content Count: 48,689 Content Per Day: 11.81 Reputation: 30,343 Days Won: 226 Joined: 01/11/2013 Status: Offline Share Posted June 25, 2016 http://www.cnn.com/2016/06/21/health/led-streetlights-ama/?iid=ob_homepage_deskrecommended_pool An incandescent bulb has a color temperature of 2400K, which means it contains far less blue and far more yellow and red wavelengths. Before electric light, we burned wood and candles at night; this artificial light has a CT of about 1800K, quite yellow/red and almost no blue. What we have now is very different. 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. Link to comment Share on other sites More sharing options...
ayin jade Posted June 25, 2016 Group: Worthy Ministers Followers: 44 Topic Count: 6,178 Topics Per Day: 0.88 Content Count: 43,795 Content Per Day: 6.21 Reputation: 11,243 Days Won: 58 Joined: 01/03/2005 Status: Offline Share Posted June 25, 2016 My city experimented with led lights in my neighborhood. For which I quite vocally protested. They have a smaller photo footprint so they do not cast enough light between the lampposts. After a couple of years of this, I notice that they are replacing them one by one with yellow lights. I do not think these are the older lights. I think these are still led lights but yellow. They do not hurt as much as the other ones do. Link to comment Share on other sites More sharing options...
other one Posted June 25, 2016 Group: Worthy Ministers Followers: 29 Topic Count: 596 Topics Per Day: 0.08 Content Count: 56,098 Content Per Day: 7.56 Reputation: 27,834 Days Won: 271 Joined: 12/29/2003 Status: Offline Share Posted June 25, 2016 I read an article lasr week that watching a smart phone can cause temporary blindness. The bright led back lights do damage your eyes. You should set your screen output to be text if you are going to read a lot on it Link to comment Share on other sites More sharing options...
missmuffet Posted June 26, 2016 Group: Royal Member Followers: 34 Topic Count: 1,991 Topics Per Day: 0.48 Content Count: 48,689 Content Per Day: 11.81 Reputation: 30,343 Days Won: 226 Joined: 01/11/2013 Status: Offline Author Share Posted June 26, 2016 3 hours ago, other one said: I read an article lasr week that watching a smart phone can cause temporary blindness. The bright led back lights do damage your eyes. You should set your screen output to be text if you are going to read a lot on it Yes, there are several warnings on smart phones. Link to comment Share on other sites More sharing options...
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