2.Methods



2.1 Equipment List

- 2 cardboard boxes
- scissors
- pen knife
- ruler, measuring tape
- 4 filament light bulbs
- 2 fluorescent light bulbs ( warm light, cool daylight)
- 1 LED lightbulb
- light bulb holders for all the different kinds of light bulbs
- Lux meter
- Tape
- Timer
-Infrared thermometer


2.2 Diagrams of the experimental setup  





 Figure 1.1: The cardboard boxes used for the experiment.



 Figure 1.2: Measurement of the light bulb holder.



Figure 1.3: Fitting the light bulb holder into the box.



    Figure 2.1:  Fitting the bulb inside the holder in the box.



   Figure 2.2: Measurement of the diameter of the light sensor.

  

Figure 2.3: The hole for the light sensor on the opposite side of the box.



Figure 3.1: Fitting the light sensor in the box.



Figure 3.2: The light sensor connected to the data logger.



Figure 3.3: The infrared thermometer to read the light bulb temperature.



Figure 4.1: Switch on the light bulb, light sensor and the data logger.



 Figure 4.2: Close both the boxes and start the timer.


  Figure 4.3: Every half an hour record the readings on the data logger.



  Figure 5.1:Every half an hour record the temperature of the light bulb.



Figure 5.2: After three hours switch off the light bulb, light sensor and data logger.


2.3 Procedures


1. Two cardboard boxes were put on the table where the experiment was conducted.
2. Dimensions of the filament bulb holder were measured. (diameter of the holder)
3. A hole was cut out in the middle of one of the box according to the
dimensions taken in step 2.
4. The filament light bulb was inserted into the hole.
5. The dimensions of the light sensor was measured (The diameter of the light sensor).
6. A hole was cut out in the middle of the opposite side of the same box according to the dimensions taken in Step 5.
7. The light sensor is inserted into the hole.
8. Steps 2 to 7 were repeated on the other box.
9. The wire of the light sensor and the display of data logger were placed out of the box.
10. Before the experiment, the temperature of each of the bulbs was recorded using the infrared thermometer.
11. The light, the light sensor and the datalogger were switched on at the same time.
12. Both the boxes were closed and the timer was started.
13. At every 0.5 hour, the results on the light sensor in the datalogger were recorded.
14. At every 0.5 hour, the temperature of each light bulb was measured and recorded.
15. Steps 13 and 14 were repeated for 3 hours.
16. After 3 hours, the light bulb and light sensor were switched off.
17. Two readings were taken for each type of bulb.

18. The average of the results was taken.
19. The data was recorded and a graph of brightness against temperature was plotted..
20. Steps 2-18 were repeated for LED light bulbs.

21. Steps 2-18 were repeated for the fluorescent light bulbs.


2.4 Risk Assessment and Management  


1. Looking directly at the light bulb may harm the eyes.Therefore, we should avoid looking at the lightbulb as far as possible.


2. When the lightbulb overheats, refrain from touching it and wait for it to cool down.


3.Avoid pointing the laser of the infrared thermometer directly at the eye or indirectly off reflective surfaces.


2.5 Data Analysis


1. The brightness and temperature of each light bulb were recorded.    (LED,fluorescent,filament)
2. The data were recorded in 3 tables one for each type of light bulbs.
3. For each data table, a graph was plotted with the temperature on the x-axis and the light intensity on the y-axis.
4.  One graph for the rise in temperature against time was plotted to compare the heating effects of the  three types of light bulbs for a duration of three hours.


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