Subject: How to make this Science Research Project sounds like a high school level ?

I've decided to make a research project on plant. The topic that I've came up 
with is about the process of photosynthesis. I need two set of plant for this 
experiment. The independent variable of this experiment is the amount of 
photosynthesis. By performing my experiment, one set of plant is going to be a 
grow as a normally method (means you water it everyday under sunlight and you 
also allow it to stay inactive during night time). The other set of plant, 
during night time, I'm going to place a light bulb right on top of that set of 
plant just to keep the photosynthesis process continually all the time. At the 
end of the experiment, I'm going to observate which plan is better looking 
than the other and how the changes has affected my experiment.
I have told my science teacher about it and ask for his approval but he has 
stated that my experiment sounds like an elementary project. Do you have any 
ideas on how to modify this experiment in order to make it sounds like a high 
school level project? Experiment over different types of soil still not 
acceptable here. I am stuck right now. Please help me !!! Thanks !

Re: How to make this Science Research Project sounds like a high school level ?