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ECU LogoEHST 3701: Industrial Hygiene Laboratory





I. Introduction




II. ObjectiveS


At the end of the session each student should be able:

1. To conduct illumination measurements

2. To analyze and interpret the results obtained

3. To give recommendations based on findings


III. Equipment and materials


1. Light meter, Extech Model EA30


IV. Methodology


A. Use of the Instrument

1. Make sure that the protective cap is on the white domed light sensor. Press the orange power button to turn power on. The meter will automatically perform a zero calibration.

2. Select the desired unit of measure (Lux or Fc). Select LUX for this experiment.

3. Remove the protective cap from the sensor and place the white domed light sensor on the surface (i.e. counter top) you would like to monitor. The light being measured must encompass the entire white sensor dome. NOTE: Do not block the light source while reading the display.

4. Read the light level on the LCD. If the light measurement is out of range, an “OL” indication will appear on the display. If the “OL” appears, select another range by pressing the RANGE button.

5. Take note of the illumination level measurements (minimum and maximum).

a. Press the MX/MN button 3 times to have the meter continue to record the highest and lowest readings (MX and MN icons is displayed on the upper left-hand portion of the LCD).

b. Press the MX/MN button once to put the meter in MX mode to display only the maximum reading (MX is displayed).

c. Press the MX/MN button again to put the meter in MN mode to display only the minimum reading (MN is displayed).

d. To exit the MX MN mode, press and hold the MX/MN button until the MX and/or MN icons disappear.

6. Press the orange power button to turn power off.


B. Illumination Monitoring


Sampling location: Laboratory


1. Perform a brief walk-through of the areas for monitoring.

2. Draw a layout of the area to be monitored.

3. Discuss and determine the location of sampling points. Measure at least 15 sampling points. Prioritize the working surfaces that are likely to be used by the lab user.

4. Perform actual illumination measurement using the light meter. Obtain the illumination levels in lux unit and slow response time.

5. Record data obtained from the monitoring and develop an illumination map.


V. Points For discussion


Note: Please use complete sentences when addressing the questions below for your discussion.


1. Describe the illumination levels in the area monitored (i.e. where the lowest and highest lighting occurs, source of lighting, etc.)

2. Are the illumination levels measured acceptable? What recommended illumination level/s did you compare your results with? Explain why you chose those levels.

3. What control measures do you recommend?




Activity Illumination (lux)
Public areas with dark surroundings 20 – 50
Simple orientation for short visits 50 – 100
Working areas where visual tasks are only occasionally performed 100 – 200
Performance of visual tasks of high contrast or large size 200 – 500
Performance of visual tasks of medium contrast or small size 500 – 1000
Performance of visual tasks of low contrast or very small size 1000 – 2000
Performance of visual tasks of low contrast and very small size for prolonged periods of time 2,000 – 5,000
Performance of very prolonged and exacting visual tasks 5,000 – 10,000
Performance of very special visual tasks of extremely low contrast and small size 10,000 – 20,000



Activity Minimum Illumination (lux)
Warehouses, homes, theaters, archives 150
Easy office work, classes 250
Normal office work, PC work, study library, groceries, show rooms, laboratories 500
Supermarkets, mechanical workshops, office landscapes 750
Normal drawing work, detailed mechanical workshops, operation theaters 1,000
Detailed drawing work, very detailed mechanical works 1,500 – 2,000







ILLUMINATION mAP Illumination Monitoring Worksheet


Date of Monitoring: ___________________________________________

Instrument Used: ____________________________________________


Sampling Location Sampling Pt. No. Operation / Activity Time of Msmt Illumination level (lux) Remarks
        Min Max  
Carol belk building room 3501 for sample 1-15            
      12:06pm 890 968  
      12:08pm 886 1013  
      12:09pm 1022 1030  
      12:10pm 656 879  
      12:11pm 684 692  
      12:12pm 1140 1163  
      12:13pm 1201 1231  
      12:14pm 1072 1123

      12:15pm 853 904  
      12:15pm 1002 1035  
      12:16pm 1005 1014  
      12:16pm 807 827  
      12:17pm 155 205  
      12:18pm 755 782  
      12:19pm 998 1055  




EHST 3701: Laboratory Exercise on Noise Monitoring Page 1


EHST 3701: Laboratory Exercise on Light Monitoring Page 5

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