I understand your thirst for knowledge of growing cannabis, but growing 5 plants from seed in a tent will not get you the concrete evidence of anything you are looking for. A real experiment has to have a lot more plants, from clones, and multiple environments with the ability to control every factor perfectly, including temperature, relative humidity, moisture content of the media, light intensity (a real light meter, not your cell phone app), etc.
I think you should just keep it simple, grow a few plants under a light, all with the same everything. As you gain experience and you get to the point where you can have a successful grow from start to finish without asking someone for help, then you should start messing around with "experiments". I put that in quotation because the vast majority of home growers don't have the ability to get accurate results in a tent at home. Good luck with your grow.