To learn more about the LEED program, visit www.usgbc.org

To become involved in a technical committee on sustainable lighting or light pollution issues, contact the International Commission on Illumination, at www.cie.co.at/cie, or Illuminating Engineering Society of North America, at www.iesna.org.

Information about the dark sky movement and International Dark-Sky Association is available at www.darksky.org. Free resources include educational materials, information sheets, and the Lighting Code Handbook-a guide to issues relative to outdoor lighting codes, their effectiveness, implementation, and enforcement.