401025 Datasheet, PDF (6/6 Pages) Extech Instruments Corporation. – Digital Light Meter

Appendix A: Typical Light Levels
Lux
Foot
Candles
20-75 2-7
75-150 7-15
150-300 15-30
Factories
Emergency Stairs,
Warehouse
Exit/Entrance
Passages
Packing Work
300-750 30-75
750-
1,500
1,500-
3,000
75-150
150-300
75-100 7-10
100-200 10-20
Visual Work:
Production Line
Typesetting:
Inspection Work
Electronic Assembly,
Drafting
Office
Indoor Emergency
Stairs
Corridor Stairs
200-750 20-75
750-
1,500
1,500-
2,000
75-150
150-2000
75-150 7-15
150-200 15-20
200-300 20-30
Conference,
Reception Room
Clerical Work
Typing, Drafting
Store
Indoors
Corridor/Stairs
Reception
300-500 30-50
500-750 50-75
Display Stand
Elevator
750-
1,500
1,500-
3,000
75-150
150-300
Show Window,
Packing Table
Storefront, Show
Window
Lux
Foot
Candles
100-150 10-15
Home
Washing
150-200 15-20
200-300 20-30
300-500 30-50
Recreational
Activities
Drawing Room,
Table
Makeup
500-1,500 50-150
Reading, Study
1,000-
2,000
75-150
100-200
7-15
Sewing
Restaurant
Corridor Stairs
150-300 15-30
300-750 30-75
750-1,500 75-150
Entrance, Wash
Room
Cooking/Dining
Room
Show Window
30-75
75-100
100-150
3-7
7-10
10-15
150-200 15-20
200-750 20-75
750-1,500 75-150
Hospital
Emergency Stairs
Stairs
Sick Room,
Warehouse
Waiting Room
Medical Exam
Room
Operating Room
5,000- 500-1000 Eye Inspection
10,000
Appendix B - Common Terms and Conversion Factors
Illuminance (Visible Flux Density)
Luminance (Visible Flux Density per Solid Angle)
Luminous Intensity (Visible Flux per Solid Angle)
Luminous Flux ( Visible Flux)
1 lm/m2 =
1 lm/m2/sr =
1 lm/sr =
1 lumen (lm) =
1 lux (lx)
10-4 lm/cm2
10-4 phot (ph)
9.290 x 10-2 lm/ft2
9.290 x 10-2 foot-candles
1 candela/m2
1 candella
1.464 x 10-3 watts @ 555 nm
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401025 Ver. 2.1 07/05