D.C. Mun. Regs. tit. 25, r. 25-G406
All rooms of a body art establishment shall have at least one (1) electrical source of light. Lighting luminaries and fixtures may be of incandescent, fluorescent, high density discharge, or light emitting dial (LED) types.
At least fifty (50) foot-candles of artificial light shall be provided in each procedure area that is positioned at the height of the workstation, and shall be provided in all decontamination and sterilization areas.
At least twenty (20) foot-candles of light shall be provided in each restroom, locker room, toilet room, or other areas when fully illuminated for cleaning.
An average illumination value of ten (10) foot-candles of light, but never less than seven and a half (7.5) foot-candles of light, shall be provided in other areas within a body art establishment, including offices, lobbies, retail shops, and waiting areas.
The above illumination levels shall be attainable at all times while the body art establishment is occupied.
D.C. Mun. Regs. tit. 25, r. 25-G406