Berwyn, IL Outdoor Lighting: Light Trespass & Shielding (2026)

Section 1250.08 of the Berwyn Code of Ordinances states that its purpose is to prevent light trespass, promote energy efficiency and minimize light pollution. It applies to all new or replacement outdoor lighting. The one carve-out is unshielded lighting for holiday decorations or permitted temporary uses under § 1244.05 (Temporary Structures and Uses). The Zoning Administrator has authority to impose reasonable restrictions on outdoor lighting as necessary to protect the health, safety and welfare of the public.

The trespass test is a measurement at the lot line. Under § 1250.08(D)(1), outdoor lighting on a lot with a non-residential use cannot exceed one foot-candle at any point on the lot line, and lighting on a lot with a residential use cannot exceed one-half foot-candle at any point on the lot line. Because the limit is tied to the lot containing the use, a residential lot carries the stricter half foot-candle standard even when it sits beside a commercial corridor. Sign illumination is handled separately and must conform to Chapter 1476 (Signs).

Section 1250.08(C)(3) adds a design rule: all lighting must be designed to prevent glare and interference with residential property, and with motor vehicle, bicycle and pedestrian traffic. Non-residential projects need a photometric plan prepared by a licensed professional and approved by the Zoning Administrator before any fixture is installed. Flashing lights, strobe lights and laser lights are prohibited, as is any lighting that could be confused with a traffic control device unless federal, state, county or local government authorizes it. On non-residential property, lights must be controlled by a photo sensor, occupancy sensor or timer so they go out no more than one hour after the close of business, excluding security lighting.