Towns and counties often develop an Outdoor Lighting Ordinance to regulate outdoor lighting. Light trespass and shielding are two important issues for public policy to consider. No direct light from any source (including streetlights) should reach another property. Adequate shielding keeps light contained to the area that needs to be lit.
Recommended Best Practices
The Illuminating Engineering Society (IES) and the International Dark-sky Association (IDA) have jointly issued this set of recommendations.
Light Trespass and Glare
Light trespass can be a serious problem for residents. Studies show that it can result in health problems.
Lighting Policy Annotated Bibliography
This document gives Colorado advocates a reference to the articles important to discussions with local governments.
Many of these articles are difficult to find.
A comparison of various outdoor lighting ordinances, as found in the bibliography.
Model Lighting Ordinance
The International Dark-sky Association and the Illuminating Engineering Society have jointly created a “Model Lighting Ordinance.”
Join the International Dark-sky Association
IDA members with a Colorado mailing address are automatically part of the Colorado chapter.
Colorado chapter members get a monthly newsletter and other benefits.