What size breaker ya gonna add? If it's above 15 amp single pole throw switch.you need 14 gauge wire and not 12 gauge.That would be due to the amp draw of the ballast.If ya put a 40 double pole you can run fans pumps and lights.Gotta make sure you can add to your panel.Gotta add all the breakers up and see on the panel door what is the max amps,too!

Ga Grown!