Amends the Responsible Outdoor Lighting Control Act. Changes the short title of the Act to the Dark Sky Act. Provides that, beginning December 1, 2026, except for any lighting that a State agency has installed or is using on the effective date of the amendatory Act, all new or renovated luminaires that are purchased or rented with State funds for the purpose of outdoor illumination and any lighting that is installed on land or easements owned, leased, or managed by the State for the purpose of outdoor illumination, including, but not limited to, on roadways, facilities, properties, nonhabitable structures, monuments, and public right-of-way spaces shall comply with specified responsible outdoor lighting requirements. Makes exceptions to the requirements. Provides that a State agency may send a request to the Department of Central Management Services to seek an exemption when planning to install, purchase, or rent lighting under one or more of the listed exceptions to the requirements in the Act. Requires the Department of Central Management Services, within 30 days of receipt, to (i) grant the exemption by memorandum, (ii) deny the exemption by memorandum, or (iii) grant the exemption by failing to issue a memorandum. Makes conforming changes to provisions that apply to the Department of Natural Resources. Changes a definition. Makes technical changes. Effective immediately.