Pinal County's dark-sky lighting ordinance and Arizona's light-pollution law limit light spilling onto neighboring property or into the sky. Fully shielded fixtures project light below the horizontal plane, curbing glare and light trespass across property lines.
Light trespass, unwanted light crossing onto a neighbor's property or upward into the night sky, is addressed through Pinal County's outdoor lighting ordinance (Development Services Code Chapter 2.195) and Arizona's light-pollution statutes. A 'fully shielded' fixture, defined in A.R.S. 49-1101, is shielded so that light rays emitted by the fixture are projected below a horizontal plane, which keeps light on the property and out of the sky. The county asks residents to shield light sources, aim lighting downward, use warm-color lower-lumen bulbs, and add timers and motion sensors so lighting is on only when needed. Persistent glare or spill onto a neighbor can also be addressed as a nuisance. Cities apply their own light-trespass rules.
Fixtures causing unlawful light spill can be cited under the county's outdoor-lighting rules; the county may require shielding or re-aiming, with fines for continued violations.
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See how Pinal County's light trespass rules stack up against other locations.
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