Here's one. I have a building 75 feet from my house that currently has a 12-2 red heater wire running in conduit and buried under ground running from my house panel on a 20 amp breaker. I am maxed out on my power wattage/amp consumption. I am running a 1000 hps at 8.9 amps and two 600 mh at 5 each, plus two small osc fans and a bathroom exhaust fan. I have had no problems running this set up. So here is my question. If I install a separate panel connected to the same 12-2 wire and from that have 3-4 separate breakers running different things, will I be able to add another light or two? Or do I need to add another cable underground to make this happen? Oh and by the way a very nice neat electrical board you have there.