Exterior lighting, except for safety lighting for steps, entryways and walkways, shall be turned off from 10:00 p.m., or at close of business, whichever is earlier, to 6:00 a.m. Only fully shielded light fixtures shall be used. Illumination from light fixtures shall not exceed 0.1 footcandle on adjacent properties. No luminaire shall exceed a maximum of 12 feet in height.