The International Dark-Sky Association (IDA) provides excellent information on how to voluntarily reduce light pollution and trespass while still providing enough light to live, work and see. The Wisconsin Department of Natural Resources has produced the “Sensible Shoreland Lighting” booklet which also covers this topic.
To learn more about how to promote and protect dark skies at the community level, check out the IDA at http://www.darksky.org and the DNR's Sensible Shoreland Lighting guide.