The Fixture Seal of Approval provides objective, third-party certification for light fixtures that minimize glare, reduce light trespass, and don’t pollute the night sky.

IDA's Fixture Seal of Appeal logo that says, "Dark Sky Approved."

The DarkSky UK works with lighting designers, manufacturers, technical committees and the public to control light pollution. To promote quality outdoor lighting, the Fixture Seal of Approval programme provides objective, third-party certification for lighting that minimizes glare, reduces light trespass and doesn’t pollute the night sky.

Find Dark Sky Friendly Lighting

DarkSky UK does not sell lighting. To find fixtures that have been certified as dark sky friendly browse our international FSA Database. (Clicking this link will open the USA DarkSky website in a new tab.)

Statement on CCT & Short Wavelength (Blue light)

With the advent of the LED, DarkSky is concerned about the potential negative effects of blue-rich white light, even from fixtures with proper shielding. In 2010, DarkSky 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 behaviour and reproduction. This is true even in cities, which are often stopover points for migratory species.

In 2014, the FSA program began requiring lighting that has a “correlated color temperature” CCT of 3,000 and lower (up to 3220K actual measured value – ANSI C78.377). IDA seeks the best possible scenario for new LED installations and retrofits to replace old technology without increasing light output and minimizing short wavelength emission while also decreasing operational costs and energy consumption

We promote environmentally responsible outdoor lighting and supports the research, development, and adoption of new technologies and encourage the lighting industry to continue the march toward lower CCT lighting products with less short- wavelength emission.