Hi there seedking, I my self do not think you will have enough juice to run all of your shit including your lighting off 1 breaker. I would suggest using a different breaker for just your lighting.

PS , your math looks fine lol.
Joel Reviewed by Joel on . Electricity, Current, Overloade circuit I have a S51 400 Watt ballast. It says it current is 4.0. So this telling me that the ballast is 480Watts/120Volts=4.0 AMP Current. I needed an extentions cord that was rated at 15AMP and is 12 Gauge Now I also have 5 2-40 Watt Flourescent fixtures in there for a total of 400 Watts.. So I am assuming that is a current of 400Watts/120volts/3.3 AMP (Am I doing this math right). The fixture has nothing on it to tell me the current. So I am now at what 4.0 + 3.3 = 7.3 and the circuit it is Rating: 5