D.C. Mun. Regs. tit. 25-A, § 3008
3008.1 The light intensity shall be:
(a) At least one hundred eight (108) lux or ten (10) foot candles at a distance of seventy-five centimeters (75 cm) or thirty inches (30 in.) above the floor, in walk-in refrigeration units and dry food storage areas and in other areas and rooms during periods of cleaning;
(b) At least two hundred fifteen (215) lux or twenty (20) foot candles:
(1) At a surface where food is provided for consumer self-service, such as buffets and salad bars, or where fresh produce or packaged foods are sold or offered for consumption;
(2) Inside equipment such as reach-in and under-counter refrigerators; and
(3) At a distance of seventy-five centimeters (75 cm) or thirty inches (30 in.) above the floor in areas used for handwashing, warewashing, and equipment and utensil storage, and in toilet rooms; and
(c) At least five hundred forty (540) lux or fifty (50) foot candles at a surface where a food employee is working with food or working with utensils or equipment including knives, slicers, grinders, or saws where employee safety is a factor.
SOURCE: Final Rulemaking published at 50 DCR 4394 (June 6, 2003); as amended by Final Rulemaking published at 59 DCR 13690 (November 30, 2012).