You'd need a multimeter to really check, they can be really cheap if you are just looking to see where you electrical is failing. If you have a full string of power through both sets, it's likely diode failures, or both.
I suggest Katsu Seeds Pre '98 line. Most phenos of his stuff leans towards the '98 smell/flavor profile. I'd just go for one of the crosses with a larger yielding cross and phenohunt my selection.
320 watts worth of high quality led diodes, such as samsung 301b/301h based boards or strips on a 320 watt driver. You could run up to 400 watts but most phenotypes wont come close to needing that amount of light to flourish.
What type of a budget are you trying to invest with?