How Hillsboro Handles Outdoor Lighting: A Practical Guide

Hillsboro maintains 117 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 Hillsboro falls on the strict-to-permissive spectrum compared to other cities.

Dark Sky Rules

Hillsboro requires full cut-off shielding on any exterior fixture emitting more than 900 lumens (roughly a 60-watt incandescent bulb) on land that goes through Type II or Type III development review. The Community Development Code caps the fixture's beam angle at 90 degrees to cut glare onto neighboring property.

Key details: Shielding trigger: >900 lumens (60W incandescent equivalent). Required fixture: IESNA full cut-off, beam angle ≤90°. Max area lighting level: 4 foot-candles at entries/pedestrian areas. Applies to: Type II/III development applications only. Relief mechanism: Variance/Adjustment under § 12.80.140.

Because these standards are enforced through the land use approval, not a standalone citation, a lighting plan that omits required shielding blocks permit sign-off outright. Once approved, unshielded or over-lumen fixtures put the project out of compliance with its conditions of approval: HCDC § 12.70.120.H states failure to fulfill any condition of approval 'shall constitute a violation of this Code and the subject approval will be subject to code enforcement proceedings,' up to revocation of the approval itself. Relief runs through a Variance or Adjustment under § 12.80.140, not an after-the-fact waiver.

Light Trespass & Shielding

Hillsboro caps how much a development's exterior lighting can spill onto neighboring land: lighting reviewed under the Community Development Code cannot raise the light level more than 1.75 foot-candles measured 10 feet past the property line. The limit applies during Type II and Type III land use review, not as a standalone nuisance citation.

Key details: Light trespass cap: 1.75 foot-candles at 10 ft past property line. Measurement point: 10 feet beyond the property line. Paired shielding rule: Full cut-off fixture required above 900 lumens. Applies to: Type II/III development applications only. Sports/recreation exception: 2 foot-candles at line, off by 11:00 p.m..

Light trespass is enforced through the land use approval process rather than a nuisance ticket for glare alone: a lighting plan projected to exceed 1.75 foot-candles at 10 feet past the property line does not clear land use review. Once built, exceeding the approved lighting plan violates the project's conditions of approval, and HCDC § 12.70.120.H makes that "a violation of this Code" subject to "code enforcement proceedings," up to revocation of the approval. The only path around the cap is a Variance or Adjustment under § 12.80.140, sought before installation.

The Bottom Line

Hillsboro'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 Hillsboro is broadly strict or permissive.

These rules come from Hillsboro's publicly available municipal code. For complete penalty schedules, exemption details, and answers to common questions, see the individual ordinance pages throughout this guide.