Dark sky friendly lighting takes into consideration a few basic design principles:
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• Use “full cutoff” -- otherwise known as fully shielded -- light fixtures where no part of the light source or its reflective and refractive elements are visible above the horizontal. With these fixtures light is aimed only downward where it is needed, not outward and upward where it is wasted.​

 

• Do not over-light an area. This saves money and energy. Reflected light can also contribute to light pollution, so it is important to use only enough light to do what is actually needed.

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• Use lighting which is "warm" or "soft-white." This light is not as harsh and is scattered less than “cool” blue-white light, and protects our health - and the night sky - much better.

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• Shut off light when not needed. Turn off lights when not in use, and incorporate timers or motion sensors which improve security and also save money and energy.

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Dark Sky Defenders recommends that all outdoor lights use fully shielded fixtures whenever possible. Lighting using bulbs emitting over 800 lumens of brightness or over 3000 kelvins color temperature - equivalent to a 60 W incandescent light bulb - should always be "fully shielded" using full cutoff lighting fixtures:

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​Examples of poor versus excellent lighting fixtures for higher efficiency and protecting the night sky, eliminating glare, and helping to prevent light from trespassing onto your neighbor's property.  Many ​dark sky friendly fixtures will have an​ IDA Seal of Approval.

Click the picture for each organization for more more detailed information on how you can help reduce light pollution.

Education about light pollution and the importance of a dark nighttime environment is key. This educational brochure is available for a minimal cost directly from Dark Sky Defenders - contact us for details or to schedule a presentation on dark skies and light pollution.