Ensure an illuminated sign complies with light-trespass / dark-sky ordinance requirements

Steps

1. Identify whether the local jurisdiction has adopted a dark-sky or outdoor-lighting ordinance (often modeled on frameworks published by dark-sky advocacy organizations) separate from its general sign code
2. Confirm shielding/cutoff requirements for the sign's light source so illumination is directed onto the sign face rather than spilling upward or onto adjacent properties
3. Confirm any maximum illuminance/light-trespass limit measured at the property line and any curfew/shutoff hours that apply to illuminated or internally lit signs specifically, not just to general site lighting
4. Check for color-temperature or lumen-output caps that some dark-sky ordinances apply to sign lighting in addition to general fixtures
5. Coordinate the sign's photometric plan with whatever documentation the ordinance requires (e.g., a light-trespass calculation) as part of the permit submittal