Sec. 33.02-52 Subparagraph I. Parking Lots, traffic areas, and loading areas shall be equipped with on-site lighting systems designed to provide illumination levels as specified in the Design Criteria Manual, provided that the director at his discretion, may require other illumination levels (such as increased illumination at employee entrances and/or exits for personal safety reasons) in regards to specific plan undergoing review. Required lighting shall be shielded to direct illumination inward and prevent glare on adjacent properties.
6.5.2 Design. ... To ensure uniform lighting of an area, the term 'minimum maintained lighting is used. In essence, this term means that the proper illuminance level prescribed for that activity in this chapter is the minimum foot-candle power allowable in the darkest section of the area. For instance, a pole-mounted luminaire (lamp) casting its light downward and spreading out forms a triangle, with the baseline where the light strikes the ground. The weakest measurement of foot-candle power of light should be found where either the left or the right leg of the triangle of light strikes the ground. Minimum maintained lighting is established at these points. All other points between the minimum maintained area and the light source will be brighter because they will be closer to the light source. Therefore, a parking lot with a one foot-candle power minimum maintained lighting level prescribed should measure one foot-candle power of illuminance at the darkest point of illumination and may read five-to 10 foot-candle power or higher directly under the light source.