As I am not an electrician I cannot comment specifically to your question.
I currently operate 3 1000w MH bulbs on a 30 amp circuit, but with a 240v outlett; not 120v. However; I have seperate outlets for my inline fans, T5 lamp, and my CO2 burner. This is on the advice of my electrician.
I have another room which operates 8 1000w HPS bulbs on a 50 amp, 240v circuit. Once again everything else is on seperate circuits.
I run the same amount of lights atm and had to bite the bullet and finally pay to get 240v in that back bedroom so we could run the rest of the house with no issues.
When it was 120v, just running a microwave for a few seconds would trip the breaker.