415 ILCS 200/10
As used in this Act:
"ANSI/IES standards" means the American National Standards Institute and Illuminating Engineering Society's lighting guidelines, also known as the IES Lighting Library Standards Collection.
"Correlated color temperature" means the measure of the approximate spectrum of the color of light of an object as perceived by the eye, measured in degrees Kelvin.
"Fully shielded" means a luminaire that is constructed in such a manner that all light emitted, either directly from the lamp or indirectly by reflection or refraction from any part of the luminaire, is projected below the horizontal plane aligned with the bottom of the luminaire aperture, where no part of the lamp protrudes outside of the luminaire or shield.
"Glare" means light emitted by a luminaire that causes visual discomfort, reduced visibility of objects, or produces momentary blindness.
"Illuminating Engineering Society Backlight, Uplight, and Glare rating" or "IES BUG rating" means the luminaire classification system developed by the Illuminating Engineering Society that ranks and defines how many lumens of light a luminaire emits backwards, upwards, and in glare.
"Lamp" means the component of a luminaire that produces light.
"Light pollution" means the scattering of artificial light into the nighttime environment caused by excessive or improperly positioned artificial outdoor lighting resulting in sky glow, light trespass, or glare.
"Light trespass" means light emitted by a luminaire that shines beyond the boundaries of the property the luminaire is intended to illuminate.
"Luminaire" means a complete installed or portable illuminating device, including a lamp, together with the parts designed to distribute the light, such as a reflector or refractor, parts to position and protect the lamps, and parts to connect the lamps to a power supply.
"Lumen" means a standard unit of measurement of luminous flux.
"Lux" means a standard unit of luminous flux expressed in lumens per square meter.
"Nadir" means the point on the ground that is directly below the center of a luminaire.
"Ornamental lighting" means a luminaire that has a historical or seasonal holiday purpose and that serves a historical or seasonal holiday purpose only.
"Outdoor luminaire" means installed or portable outdoor artificial illuminating devices used for flood lighting, roadway and area lighting, general illumination, or advertisement.
"Permanent outdoor luminaire" means exterior lighting or a system of lighting that is used in place for 7 or more days.
"Reflective roadway markings" means lines and markers with reflective properties intended to promote vehicular and pedestrian safety.
"Reflective signage" means roadway and informational signage that has reflective properties to aid with vehicular and pedestrian safety.
"Responsible lighting principles" means the use of modern lighting technologies, including shielding, an upper limit on color temperature (2,700 Kelvin), on-off controls, dimming controls, and motion sensors.
"Roadway lighting" means permanent outdoor luminaires that are specifically intended to illuminate roadways for safe vehicular and pedestrian traffic.
"Sky glow" means the brightening of the night sky due to inefficiently and improperly lit areas.
415 ILCS 200/10