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How do light pollution filters work? Do they actually help? | Astronomy.com

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How do light pollution filters work? Do they actually help?

FROM THE July 2012 ISSUE

How do light pollution filters work? Do they actually help?

Kyle Norris, Peoria, Arizona

Published: Tuesday, May 29, 2012

Light pollution reduction (LPR) filters work because many outdoor lighting sources do not shine evenly across the visible spectrum. Instead, they emit radiation at only a few distinct wavelengths. LPR filters suppress those and similar wavelengths while allowing others through. While a filtered view seldom shows more detail than an unfiltered one, or reveals an otherwise invisible target, LPR filters improve the visual aesthetics by darkening the background sky.