Got a few leaf issues going on there not sure what those are symptoms of, but yield is gonna be dependent on more then light and size, strains make a difference as well as potential leaf problems progressing in flower stage. Maybe you should list some nutes and more info about your grow environment and try to correct any issues that could pose bigger problems later on in flower, if you wanted to or not, not too bad it seems to be getting an ok amount of veg light for a limited CFL grow and 5 weeks, but she does seem to be stressing from something; although I'm not experienced enough to say, I still am dealing with other problems myself.
My sativa stretched to 5'5 from around 3 feet when going to 12/12, but the same 2 month vegd indica stayed pretty small, under 3 feet in veg and flower, minimal stretch with same veg time and nute feed but smaller pot as well, so I guess that could have potentially added to the difference.