Weld County addresses light trespass through its zoning code: outdoor light sources must be shielded so beams do not shine directly onto adjacent properties, and sign lighting may not spill more than 0.3 footcandles above ambient light onto any adjoining lot or right-of-way.
Weld County Code Chapter 23 gives residents two enforceable handles on light trespass. Section 23-3-70(F) requires outdoor light sources to be shielded so beams or rays do not shine directly onto adjacent properties and do not create a road hazard. For illuminated signs, Section 23-4-70(B) requires light sources to be directed and shielded so signs do not create spillover greater than three-tenths (0.3) footcandles above ambient conditions onto any adjoining lot or right-of-way. These apply to unincorporated land. Where no specific standard fits, a homeowner's fallback for severe, persistent light intrusion is a common-law private-nuisance claim under Colorado law. Cities of Greeley and Evans have their own lighting standards; start by contacting the neighbor, then Weld County Planning Services.
Sign or fixture lighting that spills onto a neighbor's lot beyond code limits is enforced by Weld County Code Compliance under Chapter 23, with orders to shield or redirect; severe cases may support a private-nuisance action.
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