Commission tables proposed exterior lighting rules after questions about residential enforcement and public expectations

City planning staff presented May 1 a draft zoning text amendment that would set exterior‑lighting standards for Dayton in order to limit upward light, reduce light trespass at property lines, and support the city’s dark‑sky community objectives.

The draft would: require downcast fixtures (cutoff not to exceed 90 degrees) with exceptions for U.S. flag illumination and limited architectural accents; set maximum light levels measured at property lines (staff proposed 0.5 foot‑candles for single‑family residential/agriculture and civic uses; 1.0 foot‑candle for multifamily, commercial and industrial; and 0.1 foot‑candle where commercial/industrial abuts single‑family); and set a 30‑foot maximum mounting height for most outdoor lighting. Staff also described typical permitting expectations for photometric plans on commercial projects and said smartphone light‑meter apps can give practical field measurements when complaints arise.

Commissioners raised enforcement and scope concerns. Several members said the commercial/industrial limits are straightforward and commonly used by other communities, but they worried the residential standard could spur many complaints or be difficult to police (holiday string lights, temporary sports‑field lighting, security floodlights and decorative under‑eave lighting were cited as examples). Commissioners asked staff to clarify whether existing lights would become non‑conforming and how the city would treat temporary or holiday decorations; staff recommended treating existing fixtures as legally nonconforming and requiring compliance only upon replacement, while reserving narrow exemptions for temporary holiday displays and existing municipal field lighting.

Residents and commissioners also discussed city streetlights and fixture styles that allow upward light; staff said the draft can be refined to clarify whether city‑owned fixtures are exempt or must comply with the same downcast standard. Commissioners suggested adding language to address stadium/field lighting (explicit exemptions or different standards) and to tie minimum safety lighting requirements to building code where appropriate.

After extensive discussion, Commissioner Paul Crossland moved to table the draft for further refinement; Commissioner Darren Brown seconded. The Planning Commission voted 4‑0 to table the ordinance and asked staff to return with edits clarifying residential expectations, enforcement approach (nuisance code vs. zoning text), holiday lighting language and explicit treatment of municipal street and field lighting.

Why it matters: The ordinance would affect how developers design commercial lighting and how residents and city crews install exterior fixtures. Commissioners wanted to preserve the city’s dark‑sky objectives while avoiding enforcement outcomes that would require staff to act on a large number of private residential complaints.

Next steps: Staff will refine the draft to: (1) clarify treatment of existing fixtures and legally nonconforming installations, (2) provide a more explicit enforcement pathway (nuisance vs. zoning enforcement), (3) add or clarify exemptions for holiday/temporary lighting and for municipal or athletic field lighting, and (4) define whether residential decorative under‑eave lighting must meet permanent fixture standards.