Columbia, SC Outdoor Lighting: Billboard Lighting (2026)

Sec. 10(c) of the zoning ordinance regulates illumination on every permanent sign in the city, and a freestanding outdoor advertising (billboard) sign is a permanent sign under this Section, so it falls under the same illumination rule as storefront and monument signs. The Illumination standard permits chaser lights wired with individual bulbs rated 15 watts or less, or pulsating and flashing neon tubing, but only on a sign mounted at least 10 feet above finished grade and set back at least 25 feet from the nearest property line.

Below those thresholds, that kind of lighting isn't allowed at all. Separately, exterior floodlighting and general site lighting are governed by Sec. 9, Exterior Lighting, except that Sec. 9(b)(2)e specifically exempts lighting solely for signage from that chapter's footcandle, height, and full cut-off fixture rules, meaning sign and billboard lighting is controlled exclusively through Sec. 10, not the general lighting chapter. For electronic message centers and digital billboard faces, Sec. 10(c)(3) layers on additional brightness controls: automatic brightness compensation is mandatory, luminance cannot exceed 1,500 candelas per square meter in daylight or 150 candelas per square meter after dark, and copy must hold for at least six seconds between changes.

The Zoning Administrator reviews illuminated sign and billboard applications through the standard Sign Permit process under Sec. 5(o), and a sign's illumination hardware is subject to the same maintenance standard as the rest of the structure, so exposed lighting or electrical systems that have deteriorated into an unsightly condition are treated as a maintenance violation.