How Cambridge Handles Outdoor Lighting: A Practical Guide

Cambridge maintains 115 local ordinances across all categories, and 2 of those deal specifically with outdoor lighting. Here is a breakdown of what the city actually requires, what is prohibited, and where Cambridge falls on the strict-to-permissive spectrum compared to other cities.

Light Trespass

Cambridge prohibits outdoor lighting that creates nuisance glare or spills onto neighbor property in excess of zoning limits, with enforcement through Inspectional Services and nuisance law.

Key details: Residential limit: 0.1 fc at line. Direct illumination: Must stay on-site. Complaints: iReport or 311. Color temp: Under 3000K preferred. Holiday lights: Generally tolerated temporarily.

Contact your local code enforcement office for specific penalty information.

Dark Sky Rules

Cambridge Zoning Ordinance requires outdoor lighting to be shielded and directed downward to minimize glare and light trespass, supporting Net Zero and energy efficiency goals.

Key details: Fixture standard: Full cutoff shielded. Direction: Downward. Residential trespass: 0.1 fc at line. Commercial trespass: 1.0 fc at line. Complaints: Inspectional Services.

Contact your local code enforcement office for specific penalty information.

The Bottom Line

Cambridge's outdoor lighting rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Cambridge is broadly strict or permissive.

Keep in mind that Cambridge can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.