Creates the Street Light Energy Conservation Act. Provides that, within 5 years after the effective date of the Act, each street light entity (a unit of local government, a public utility, and the State) exercising control over any street lights in the State shall install or replace each street light in the State, subject to appropriation, as follows: (1) the street light must be installed or replaced using LED technology; (2) the minimum illuminance must be adequate for the intended purpose of the street light and must be used with consideration given to nationally recognized standards; (3) for lighting of the State highway system, installation or replacement applies only if the Department of Transportation determines that the purpose of the street light cannot be achieved by the installation of reflective road markers, lines, warning, informational signs, or other effective passive methods; and (4) installation or replacement shall occur only after full consideration has been given to energy conservation, reducing glare, minimizing light pollution, and preserving the natural night environment. Includes exceptions to the requirement to install or replace each street light in the State with LED technology. Limits the concurrent exercise of home rule powers. Effective immediately.