For sheltered parking lots with average environments, IES advises least flat illuminance of 0.2 foot-candles, least vertical glow of 0.1 foot-candles and uniformity proportion at 20:1 maximum-to-least. With improved safety standards, IES proposes minimal horizontal gleam at 0.5 foot-candles, minimum vertical shine of 0.25 foot-candles and uniformity ratio of 15:1 maximum to lowest.