Light Levels
 
  Footcandles Lux
Building Exterior-Site areas adjacent to
     Active Entrances-pedestrian or vehicle 5 fc 50 lx
     Inactive Entrances - normally locked 3 fc 30 lx
     Vital locations or structures (security) 5 fc 50 lx
     Building surroundings 1 fc 10 lx
Parking Areas
     High Activity 3.6 fc 36 lx
     Medium Activity 2.4 fc 24 lx
     Low Activity 0.8 fc 8 lx
Roadways - Non-dedicated and Private
     High Activity 2 fc 20 lx
     Medium Activity 1 fc 10 lx
     Low Activity 0.5 fc 5 lx
Signs
     Bright surroundings, light surfaces 30 fc 500 lx
     Bright surroundings, dark surfaces 50 fc 1000 lx
     Dark surroundings, light surfaces 10 fc 200 lx
     Dark surroundings, dark surfaces 30 fc 500 lx
Buildings (Suburban)
     Terra Cotta, light marble, plaster 10 fc 100 lx
     Bedford or buff limestone, smooth buff face brick, concrete, aluminum 15 fc 150 lx
     Smooth or medium gray brick, common tan or dark field gray brick 20 fc 200 lx
     Brownstone, stained shingles, other dark surfaces 35 fc 350 lx