No idea about the light but the new tent will certainly make your life easier. That's a perfect size to grow 4 big girls.
There's a lot of LED experts around here, you might want to post your question in a specific forum for that. Someone will be more than happy to advise you over there.
Kingbrite sent me instructions via email this morning. (More instruction than what I got from HLG!)
I am ready to get it all set up so that I can start sleeping better at night lol.
Edit: I think the biggest girl will get the 31"x31" while I move the smaller girls into the new tent.