Extech Instruments 401025, User Manual

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401025-en-GB_v2.6 6/17 7
Appendix A - Typical Light Levels
Lux Foot
Candles Lux Foot
Candles
Factories Home
20-75 2-7 Emergency Stairs,
Warehouse 100-150 10-15 Washing
75-150 7-15 Exit/Entrance Passages 150-200 15-20 Recreational
Activities
150-300 15-30 Packing Work 200-300 20-30 Drawing Room,
Table
300-750 30-75 Visual Work: Production
Line 300-500 30-50 Makeup
750-1,500 75-150 Typesetting: Inspection
Work 500-1,500 50-150 Reading, Study
1,500-
3,000 150-300 Electronic Assembly,
Drafting 1,000-
2,000
100-200 Sewing
Office Restaurant
75-100 7-10 Indoor Emergency Stairs 75-150 7-15 Corridor Stairs
100-200 10-20 Corridor Stairs 150-300 15-30 Entrance, Wash
Room
200-750 20-75 Conference, Reception
Room 300-750 30-75 Cooking/Dining
Room
750-1,500 75-150 Clerical Work 750-1,500 75-150 Show Window
1,500-
2,000 150-2000 Typing, Drafting
Store Hospital
75-150 7-15 Indoors 30-75 3-7 Emergency Stairs
150-200 15-20 Corridor/Stairs 75-100 7-10 Stairs
200-300 20-30 Reception 100-150 10-15 Sick Room,
Warehouse
300-500 30-50 Display Stand 150-200 15-20 Waiting Room
500-750 50-75 Elevator 200-750 20-75 Medical Exam Room
750-1,500 75-150 Show Window, Packing
Table 750-1,500 75-150 Operating Room
1,500-
3,000 150-300 Storefront, Show Window 5,000-
10,000
500-1000 Eye Inspection
Appendix B - Common Terms and Conversion Factors
Illuminance (Visible Flux Density)
1 lm/m2 =
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
Luminance (Visible Flux Density per Solid Angle)
1 lm/m2/sr = 1 candela/m2
Luminous Intensity (Visible Flux per Solid Angle) 1 lm/sr = 1 candella
Luminous Flux ( Visible Flux) 1 lumen (lm) = 1.464 x 10-3 watts @ 555 nm
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