I believe that many people over do the lights anyways...you are completely right about what you chose. However, I would be willing to bet that if you put some Foxfarm in that you would get twice the plant. I put foxfarm on my husbands old icky plants in the window (house plants) and within two days they were blooming and very perky. As far as piss, I could see that, after all, what we exhale through our mouth is their perfect air.
What I have learned in all of these wonderful growing teachers on this and other sites is that there are many ways to grow. It is a weed after all and we do know how those survive.
You have done a great job!!