Lake Elsinore, CA Outdoor Lighting: Dark Sky Rules (2026)

Lake Elsinore Municipal Code § 17.112.040, in the nonresidential development standards chapter, requires that all outdoor lighting fixtures exceeding 60 watts be oriented and shielded to prevent direct illumination above the horizontal plane passing through the luminaire, and to prevent glare or direct illumination from reaching adjacent properties or streets. The section explicitly states the reason: the City's proximity to the Mount Palomar Observatory, and it encourages the use of low pressure sodium lighting because that light source produces a narrow spectral band that is far easier for the observatory's astronomers to filter out than broad-spectrum white light.

Because § 17.112.010 makes Chapter 17.112's general provisions apply to all nonresidential projects citywide regardless of which zoning district they sit in, and controlling only where a specific district's own regulation is silent or less restrictive, this 60-watt shielding threshold functions as the City's baseline dark-sky standard for commercial, office and industrial development everywhere in Lake Elsinore, not just in one district. The requirement is enforced through the Community Development Department's design review and building permit process: a nonresidential project's photometric or fixture plans are checked against § 17.112.040 before permits are issued, and a fixture that floods light upward or onto a neighbor's parcel does not meet the code's orientation-and-shielding standard regardless of its wattage rating on paper.

The rule does not set a numeric light-trespass or foot-candle ceiling; its test is functional, whether the fixture is shielded and oriented to keep light at or below the horizontal plane and off adjoining land.