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Bosworth Instrument Training Sheet Series

Light Meters

 What is a light meter?

A light meter measures the level (amount) of visible light (illumination) in a given area tested. Illumination is expressed in units of LUX (metric) and Foot candles (English).

Alternate Light Meter Terms

     •                LUX Meter
     •                Foot Candle (Fc) Meter  
 

How do I measure and convert Foot candles, LUX, and Lumens?

The most common units of light measurement are LUX, Foot candles, & Lumens per sq. ft.
        •                Multiply Foot candles by 10.76891 to convert to LUX
        •                Multiply LUX by 0.09290304 to convert to Foot candles
        •                Foot candles = Lumens per sq. ft. (no conversion necessary).
 
Applications for specific lighting types
     Sodium: Highway, parking lots, security
     Tungsten: Daylight and incandescent lighting 
     Mercury: Highways, parking lots, stadiums 

     Fluorescent: Indoor lighting
Light Meter Applications
      •                OSHA work environment compliance
      •                Schools and other exam/test areas
      •                Sensitive antiques, museum exhibits, artwork, etc.
      •                Security lighting and nighttime ATM areas 
      •                Computer and clean room standards compliance
      •                Photography and video applications
 
 
 
Do you have light meters that will measure both Lux and Foot Candles ?
 
     •       Yes- a great meter that does both is the Extech #EA31 Foot Candle/Lux Meter. It accurately displays light    level in terms of Fc or Lux over four ranges.
  
I need to measure light level in a parking lot. Do you have a light meter that can accurately measure High Pressure Sodium Lamps as well as other types of light bulbs?
   
     •         Yes- The Extech #407026 offers 4 different selection modes- for enhanced accuracy-Tungsten/Daylight, Fluorescent, Sodium and Mercury lamps.
 
 What are common Lux and Foot Candle levels. Do you have a chart ?
     •           See below for common LUX/Foot candle  light levels in factories, hospitals, retail stores, restaurants and more.
 

               Typical Light Levels
    Showing both Lux and Foot Candles 
                                                                                                                                

  
Lux Level
Foot
Candles
Factories
Lux Level
Foot Candles
Store
20 to 75
2-7
Indoor Emergency Stairs, Warehouse
75 to 150
7-15
Indoors
75 to 150
7-15
Exit/Entrance Passages
150 to 200
15-20
Corridor/Stairs
150 to 300
15-30
Packing Work
200 to 300
23-30
Reception
300 to 750
30-75
Visual Work: Production Line
300 to 500
30-50
Display Stand
750 to 1,500
75-150
Typesetting: Print Shop
 Inspection Work
500 to 750
50-75
Elevator
1,500 to 3,000
150-300
Electronic Parts, Assembly Line, Drafting
750
 to 1,500
75-150
Show Window, Packing Table
 
 
Office
1,500
 to 3,000
150-300
Storefront, Show Window
75 to 100
7-10
Indoor Emergency Stairs
 
 
Hospital
100 to 200
10-20
Corridor Stairs
30 to 75
3-7
Emergency Stairs
200 to 750
20-75
Conference, Dining or
 Reception Room
75 to 100
7-10
Stairs
750 to 1,500
75-150
Clerical Work
100 to 150
10-15
Sick Room, Warehouse
1,500 to 2,000
150-200
Typing, Drafting
150 to 200
15-20
Waiting Room
 
 
Home
200 to 750
20-75
Medical Examination Room,
 Dining Room
100 to 150
10-15
Washing
750 to 1,500
75-150
Operating Room,
 Emergency Treatment
150 to 200
15-20
Recreational Activities
5,000
to 10,000
500-1000
Eye Inspection
200 to 300
20-30
Drawing Room, Table
 
 
Stairs
300 to 500
30-50
Makeup
30 to 75
3-7
Emergency Stairs
500 to 1,500
50-150
Reading, Study
75 to 300
7-30
Indoor Gymnasium, Auditorium,
Wash Room
1,000 to 2,000
100-200
Sewing
300 to 750
30-75
Class Room
 
 
Restaurant
750 to 1,500
75-150
Drafting Room, Laboratory, Library
75 to 150
7-15
Corridor Stairs
 
 
Beauty Salon
150 to 300
15-30
Entrance, Wash Room
300 to 750
30-75
Shaving, Hair washing Dressing
300 to 750
30-75
Cooking Room, Dining Table
750
to 1,500
75-150
Hair Dyeing, Makeup, Hair Dressing
750 to 1,500
75-150
Show Window
 
 
 
 

 


Bosworth Instrument 1995 E. 55th St.  Cleveland, OH 44103  |  800-804-6216  |  info@bosworthsupply.com

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