D.C. Mun. Regs. tit. 22, r. 22-A3828
Each room in a MHCRF shall have adequate lighting, and each bedroom shall have sufficient light for reading.
Each bathroom and hallway shall contain a nightlight, and nightlights shall be offered to residents for use in their sleeping rooms.
Each outside entrance shall be lighted.
All habitable rooms used for living or sleeping, including the kitchen, and all bathrooms, hallways, and stairways shall meet the lighting requirements of § 402 of the D.C. Property Maintenance Code and §§ 502 through 505 of the D.C. Housing Code (14 DCMR §§ 502 - 505), except where the D.C. Housing Code requirements are superseded by the D.C. Property Maintenance Code.
Every space intended for human occupancy shall be provided with adequate natural or mechanical ventilation as required by § 403 of the Property Maintenance Code.
D.C. Mun. Regs. tit. 22, r. 22-A3828