4.1 - Analysis of Results
The first step of drawing a specific set of conclusions is to find a way to compile our data into a more manageable size, while still maintaining the values present in the initial sets of data. We did this by finding the average readings of luminosity at a 1 metre distance and temperature in degrees celsius for each type of bulb. The table and graph for average is shown below.
Next, we will find the average luminosity-to-temperature ratio of the various light bulbs. The table and graphs are shown below.
4.2 - Key Findings
As you can see, LED bulbs have the highest luminosity-temperature of 2.278 lux/°C. (in 3 decimal places) This is followed by incandescent bulbs with 1.586 lux/°C, and finally fluorescent bulbs with 1.417 lux/°C. (all figures are correct to 3 decimal places)
The luminosity-temperature ratio of the fluorescent bulb was surprisingly less than the incandescent bulb’s ratio.
4.3 - Explanation of Key Findings
As stated in our research, the incandescent bulb needs to be heated to a certain high temperature before the tungsten filament illuminates and gives off any light. In comparison, fluorescent bulbs and LED bulbs do not require a high temperature to light up, just an electric current of sufficient voltage.
The inefficient method of producing light by the incandescent bulb most likely contributes to the low luminosity-temperature ratio of 1.586 lux/°C.
For the unexpectedly low ratio for the fluorescent bulb, it could be because the incandescent bulb that we bought was comparatively more expensive than our fluorescent bulb. This might have resulted in the incandescent bulb being more energy-efficient that the fluorescent bulb, due to the fact that the incandescent bulb could be of higher quality.
4.4 - Evaluation of Hypothesis
Therefore, the experiment results prove our hypothesis to be partly true. The LED bulb does have the highest luminosity-temperature ratio of 2.278 lux/°C. However, the incandescent bulb does have a higher luminosity-temperature ratio of 1.586 lux/°C than the fluorescent bulb, with a luminosity-temperature ratio of 1.417 lux/°C. This is contradictory to our original hypothesis, and the explanation can be found above. (all figures are correct to 3 decimal places)
4.5 - Areas for Improvement
We have come up with a few ways to improve on any future experiments.
- Try to purchase light bulbs of same or close price.
- Ensure that light bulb wattage is identical.
- Test a wider range of light bulbs. (halogen bulbs/other fluorescent bulbs)