Whats up? Welcome to the forums!
Its always worth putting more lighting in lol. You shouldnt worry about the yellow leaves on the bottom. The plant is actually using the energy in them so why cllip them off? They will fall off when they are completely useless.
LED lighting would be your best bet for side lighting as it puts out little to no heat. Only problem is they are expensive for the ones that work. CFLs work great as side lighting but they do put off heat.
DISCLAIMER: everything I post and say are lies. I am simply roleplaying. All photos were found on the internet and/or fake!! I do not grow or use anything illegal.