Outdoor Facilities

Area / Activity

Lux

Foot-candles

Area / Activity

Lux

Foot-candles

Building (construction)

Continued, Electric generating stations - exteriors

General

100

10

Storage tanks

10

1

Excavation work

20

2

Coal storage piles, ash dumps

2

0.2

Building exteriors

Hydroelectric

Entrances

Power house roof, stairs, platform and

Active (pedestrian and/or conveyance)

50

5

intake decks

50

5

Inactive (normally locked. Infrequently used)

10

1

Inlet and discharge water area

2

0.2

Vital locations or structures

50

5

Intake structures

Building surrounds

10

1

Deck and lay-down area

50

5

Buildings and monuments, floodlighted

Value pits

20

2

Bright surroundings

Inlet water area

2

0.2

Light surfaces

150

15

Parking areas

Medium light surfaces

200

20

Main plant parking

20

2

Medium dark surfaces

300

30

Secondary parking

10

1

Dark surfaces

500

50

Substation

Dark surroundings

Horizontal general area

20

2

Light surfaces

50

5

Vertical tasks

50

5

Medium light surfaces

100

10

Transformer yards

Medium dark surfaces

150

15

Horizontal general area

20

2

Dark surfaces

200

20

Vertical tasks

50

5

Electric generating stations - exteriors

Turbine areas

Boiler areas

Building surrounds

20

2

Catwalks, general areas

20

2

Turbine & heater decks unloading

Stairs and platforms

50

5

bays

50

5

Ground level areas including precipitators

  Entrances, stairs and platforms

50

5

FD & ID fans bottom ash hoppers.

50

5

Loading and unloading

Cooling towers

Platforms

200

20

Fan deck, platforms, stairs, valve areas

50

5

Freight car interiors

100

10

Pump areas

20

2

Piers

Fuel handling

Freight 

200

20

Barge unloading, car dumper, unloading

Passenger

200

20

hoppers, truck unloading pumps, gas

Active shipping area surrounds

50

5

metering.

50

5

Prison Yards

50

5

Conveyors

20

2