D.C. Mun. Regs. tit. 25, r. 25-D811
All rooms of a massage establishment or health spa facility shall have at least one (1) electrical source of light. Lighting luminaries and fixtures may be of incandescent, fluorescent, or high density discharge types.
At least fifty (50) foot-candles of light shall be provided in each area and the laundry area.
At least twenty (20) foot-candles of light shall be provided in each bathroom, 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 7.5 foot-candles of light shall be provided in other areas within a massage establishment or health spa facility, including massage therapy rooms, offices, lobbies, retail shops, and waiting areas.
The above illumination levels shall be attainable at all times while the massage establishment or health spa facility is occupied, except as specified in section 811.6.
Lighting may be dimmed for therapeutic reasons during a massage therapy session so long as there is enough light to safely see to conduct the massage therapy or to leave the room in case of an emergency.
No massage establishment or health spa facility shall be equipped with tinted windows or two-way mirrors in any room therein.
No massage establishment or health spa facility shall be equipped with any electronic, mechanical, or artificial device used or capable of being used for recording either audio or video activities, conversations, or other sounds in massage therapy rooms or any other room used by customers.
D.C. Mun. Regs. tit. 25, r. 25-D811