Conclusion
My conclusion is that my hypothesis was incorrect.
As the distance increased, the light intensity did not decrease according
to the Inverse Square Law. After I had completed the experiment, I found
out that the Inverse Square Law only occurs in darkness. I did the experiment
in the dark, but not in pure darkness. Also my hypothesis was wrong,
because the energy saving light bulb didn’t have the same light intensity
as the 60 watt light bulb.