The International Dark-Sky Association is the authoritative voice on light pollution. IDA educates lighting designers, manufacturers, technical committees and the public about controlling light pollution. We recognize that the best way to accomplish our goal of protecting and restoring our natural night environment is through the promotion of quality outdoor lighting. To achieve this, we developed the Fixture Seal of Approval program to provide objective, third-party certification for lighting that minimizes glare, reduces light trespass and doesn’t pollute the night sky.
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FSA Guidelines Revised at the End of 2014 to Address Color Temperature
From the program’s inception, the Fixture Seal of Approval criteria have only specified shielding and light distribution requirements. With the advent of the LED, IDA is concerned about the potential negative effects of blue-rich white light, even from fixtures with proper shielding. In 2010, IDA published a white paper outlining the potential hazards of blue-rich white light sources. Since then the scientific evidence has solidified around its conclusions.
The case against blue light is well founded with regard to discomfort glare, circadian rhythm disruption, light scattering, skyglow and biological system disruption in wildlife.
Outdoor lighting with high blue light content is more likely to contribute to light pollution because it has a significantly larger geographic reach than lighting with less blue light. In natural settings, blue light at night has been shown to adversely affect wildlife behavior and reproduction. This is true even in cities, which are often stopover points for migratory species.
In order to address to these concerns, The IDA Fixture Seal of Approval program now only accept products that offer a listed correlated color temperature configuration of 3000K and lower (up to 3220K actual measured value – ANSI C78.377). Recently approved products in a configuration of 4100K CCT and below (IDA’s previous CCT criteria) will have one year to comply with the new standard.