Foreign lighting standard reference application city suburban country light marble and gypsum 150 100 50 light yellow limestone, smooth light yellow brick, etc. 200 150 100 smooth gray brick, brick black gray brick 300 200 150 brownstone sandstone building, other black surface 500 350 200 Japanese architectural lighting illuminance standard (Lx) surface material background brightness is generally dark downtown small city rural illumination emission ratio (%) 12 (cd / m 2 ) 6 (cd / m 2 ) 4 (cd / m 2 ) white Marble white 80 150 100 50 Concrete Ming 60 200 150 100 Yellow brown brick 35 300 200 150 Dark gray brick dark 15 500 300 200 Note: 1. Bright: commercial street, billboard intensive area; general: commercial street with few billboards ;Dark: no advertising place; 2. This table is taken from the Japanese Night Lighting Guide. Recommended by the United States for the building and monument flood light value recommendation table (IESNA, Lighting Handbook, 2000). The average illumination (vertical) is illuminated by the facade and environmental conditions. (lx/ft-cd) bright background and light surface 50/5 bright background and lighter color surface 70/7 bright background and deeper color surface 100/10 bright background and light surface 150/15 dark background and Light-colored surface 20/2 dark background and
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