D.C. Mun. Regs. tit. 22, r. 22-B3426
All habitable rooms shall have window areas and ventilation levels in accordance with the D.C. Building Code (12 DCMR).
Obscure glass, glass blocks, or similar non-transparent or distortion-producing material for openings shall not satisfy window area requirements for habitable rooms under this section.
General lighting levels in non-sleeping rooms throughout each community residence facility shall be not less than ten (10) foot-candles.
Incandescent fixtures shall be equipped with at least sixty (60) watt light bulbs.
Additional lighting levels shall be provided by each community residence facility in the kitchen and laundry areas and as may be needed for special tasks, or at the request of a resident.
Night lights shall be provided in bathrooms, hallways and, if requested, in residents' bedrooms.
Outside entrances shall be well lighted at times when they are likely to be in use.
D.C. Mun. Regs. tit. 22, r. 22-B3426