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Commissioners favor 100‑nit nighttime cap for electronic message signs in commercial and industrial districts
Summary
After a lengthy discussion of measurement methods and enforcement, Louisa County planning commissioners indicated a preference for an electronic message‑sign standard that would cap nighttime brightness at 100 nits in specified nonresidential districts and require administrative review or special exceptions for uses in other zones.
Louisa County planning commissioners discussed several measurement and enforcement options for electronic message signs during the May work session and signaled support for a modest nighttime brightness cap and selected zoning coverage.
Planning staff told commissioners they investigated measurement methods and recommended using luminance measured in nits (candelas per square meter), a method used by Fairfax County and recommended by the International Sign Association, because it can be measured at any time of day and simplifies field enforcement. "Nits can be measured daytime or nighttime," staff said, noting that a handheld meter can…
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