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Concord planning board proposes Dark‑Sky‑aligned exterior lighting rules to curb glare and protect habitat
Summary
A proposed new exterior lighting bylaw would replace the town’s limited parking‑focused standard with comprehensive site and building lighting requirements including a 2,700K CCT cap, fully shielded fixtures, LED requirement for redevelopments, and hour limits for non‑security lighting; the change would apply to new projects subject to site plan review, not single‑family homes.
The Concord Planning Board presented a zoning bylaw amendment (Article 32) that would replace the town’s limited existing lighting rules with a comprehensive exterior lighting bylaw designed to reduce light pollution, align with the Dark Sky Massachusetts model, and protect natural habitats.
The proposal would move lighting standards out of the off‑street parking section and into site and building review, covering building‑mounted fixtures (for example, above or adjacent to doorways), walkways, and site lighting. Key technical changes include a maximum correlated color temperature (CCT) of 2,700K for luminaires, a requirement that fixtures be fully shielded (dark‑sky compliant), limits on operating hours except for security lighting, and a mandate that lights be LED or an equivalent sustainable alternative for substantial redevelopment projects.
“As one presenter asked rhetorically during the discussion, ‘When was the last time you saw the Milky Way?’” The board framed the changes as measures to reduce glare and blue‑rich light that can interfere with human and wildlife circadian rhythms and to preserve night‑sky views. The board said the current rule applies only to some parking and loading areas and lacks measurable standards; the amendment would integrate lighting into site plan review so projects are evaluated for compliance as part of normal permitting.
The board noted that the bylaw would affect commercial, industrial, planned residential, mixed‑use and institutional developments that require site plan review, while single‑family dwellings would be excluded. Existing properties that must relocate or replace noncompliant luminaires as part of larger redevelopment would also need to comply.
No formal vote was recorded in the public hearing; the board moved on after soliciting public comment and receiving none on this article.
