The Dark Sky Act regulates outdoor lighting in Illinois to reduce light pollution.
The Dark Sky Act, also known as the Responsible Outdoor Lighting Control Act, sets stringent guidelines for outdoor lighting in Illinois to minimize light pollution. It mandates that all outdoor lighting, including facade lighting, must not exceed 25% above ANSI/IES standards. Luminaires must be fully shielded to prevent light trespass, glare, and sky glow. The Act also requires that luminaires emit no more than 5% of their total lumen output above 80 degrees from nadir and have a correlated color temperature of no more than 2,700 Kelvin.
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- Core Provisions
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- Legal Framework
- Critical Issues
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