4.Discussion




4.1 Analysis of results


For filament light bulb, the results show us that the temperature of the light bulb keeps increasing throughout the whole experiment. In the first part of the experiment the temperature increases drastically. However, towards the end of the experiment, the temperature increases by a few degrees. The brightness of the filament light bulb after switching on reaches 768.9 and remains constant throughout the whole experiment. The brightness did not change.


In the case of fluorescent light bulb, the results show us that the temperature of the fluorescent bulb keeps increasing throughout the whole experiment, but there is only a minor increase each time. The brightness of the filament light bulb after switching on reaches 768.9 and remains constant throughout the whole experiment. The brightness of this light bulb did not change.


For the LED light bulb, there is a small increase temperature in the first half an hour.After the first one hour, the temperature remains the same. The brightness of the LED light bulb after switching on reaches 768.9 and remains constant throughout the whole experiment. No change was observed.


4.2 Key findings
We found out that, the brightness of the light bulbs did not change.The rise of temperature in the light bulbs did not affect the brightness of the light bulb. In the case of fluorescent bulb and LED the heating effect of the bulb caused only a small change in temperature. In the case of fluorescent bulb, although heating effect caused a significant change in temperature, temperature does not have an effect on brightness.


Thus, the heating effect of the three types of the light bulb does not cause any changes in the brightness of the light bulb when it is switched on for 3 hours continuously.


4.3 Explanation of key findings


For filament light bulb, the results show us that the temperature of the light bulb keeps increasing throughout the whole experiment, but  the brightness did not change. Although there is a significant rise in temperature, on verifying with data for tungsten filament it was found that the temperature range does have significant effect on the brightness as the temperature is still below 900K (Forsythe & Worthing, 1925).


In the case of fluorescent light bulb, the results show us that the temperature of the fluorescent bulb keeps increasing throughout the whole experiment, but there is only a minor increase each time. The brightness of this light bulb did not change. This can be explained by the fact that the rise in temperature is small to cause a significant change in brightness.For the LED light bulb, after the first one hour, the temperature remains the same. No change was observed in brightness.


However, if the light bulb is left on for longer durations, a slight change in the brightness may be observed. However the filament light bulb might fuse before that.  


4.4 Evaluation of Hypothesis


The hypothesis made before conducting the experiment was that the heating effect of the light bulbs (LED, fluorescent, filament) for a duration of three hours would affect the brightness of the light bulbs. However, after carrying out our experiment for a duration of 3 hours, we found out that the hypothesis we made was false. In fact, the brightness did not change, even though, the temperature of the different light bulbs; Filament, fluorescent, LED changed.
Thus, we can conclude that the heating effect of the bulb does not cause any change in brightness of the light bulbs. The conclusion is valid for filament bulb, fluorescent light bulb and LED for a continuous duration of 3 hours only.



4.5 Areas for improvement

As stated before, the experiment conducted for each of the bulbs was only three hours.Also, as 3 hours was the standard timing given on the internet, we assumed that it would be enough. For further research, we could put in a few more hours into the experiment. Doing the experiment over a few days  could have been possible if the temperature reading is automated and not manual.

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