Electrical question

I am going to add a receptable on a line that has a 40 watt light for attic (hardly used) and one upstairs bathroom outlet. I am probably going to have to use a power strip because I think I need three inlets for three cords- one for a 400 watt hps/mh light. One for a 200cfm 4" inline fan (approx 100watts) and a small oscillating fan in grow area (not sure of wattage but will get low one) hoping to keep it under 800 watts which is about half capacity for a 15 amp breaker I believe. Does this seem acceptable?

actually, 720 watts would be half the allowable load for a 15 amp general purpose circuit. Hopefully the 15 amp breaker will let you know if running the hair dryer and the grow op at the same time overloads the circuit. You should have no trouble outside of extrordinary circumstance.