SPRINGFIELD – To reduce light pollution in Illinois’ dark skies, State Senator Laura Ellman sponsored a law to advance responsible outdoor lighting standards.

“Light pollution is not as often discussed as other forms of environmental contamination, but excess artificial light poses serious health threats to animals, insects and humans,” said Ellman (D-Naperville). “Working with the Illinois Department of Natural Resources brings us closer to making Illinois dark sky compliant, and I look forward to expanding these standards.”

Light pollution refers to the brightening of the night sky by man-made light sources, including street lights and buildings. Excessive light in our night sky causes a variety of issues, such as interfering with bird migration, nocturnal insects and our optical health.

Ellman’s law creates the Outdoor Lighting Control Act, requiring all new luminaries purchased with state funds for land or structures owned by the Illinois Department of Natural Resources to follow specific outdoor lighting requirements established by the American National Standards Institute and Illuminating Engineering Society.

“Light is essential for human life, but using it excessively is wasteful and unnecessary,” said Ellman. “This law establishes responsible, efficient lighting standards that use energy only when needed, minimizing disruptions to both animals and humans.”

Senate Bill 3501 was signed into law on Friday and takes effect Jan. 1, 2025.