International Dark Sky Places
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ABOUT IDA's FIXTURE SEAL OF APPROVAL
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The International Dark-Sky Association is the authoritative voice on light pollution. IDA educates lighting designers, manufacturers, technical committees, and the public about light pollution abatement. We recognize that the best way to accomplish our goal of protecting and restoring our natural night environment and our heritage of dark skies is through promotion of quality outdoor lighting. It is in this spirit that we have developed the Fixture Seal of Approval (FSA) program for dark sky friendly fixtures.
The Fixture Seal of Approval provides objective, third-party certification for luminaires that minimize glare, reduce light trespass, and don’t pollute the night sky.
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; in the years since the report was issued 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, sky glow, 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 will now only accept products that offer a listed correlated color temperature (CCT) 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.
Residential Products without Photometry:
Correlated Color Temperature:
IESNA Definition: the absolute temperature of a blackbody whose chromaticity most nearly resembles that of the light source.
The correlated color temperature (CCT) is a specification of the color appearance of the light emitted by a lamp, relating its color to the color of light from a reference source when heated to a particular temperature, measured in degrees Kelvin (K). The CCT rating for a lamp is a general "warmth" or "coolness" measure of its appearance. However, opposite to the temperature scale, lamps with a CCT rating below 3200 K are usually considered "warm" sources, while those with a CCT above 4000 K are usually considered "cool" in appearance.
Hundreds of products and over a hundred manufacturers have already been approved under our Fixture Seal of Approval program.