how many amps does a 600w light use?

I'm just wondering if its safe to run 2 600w lights with digital ballasts on a 15 amp 120v breaker? I already have 2 600's on seperate breakers but I wanted to ad more soon but I would need to run them to the same breakers just trying to make sure it would be safe or if I'm going to need to run a new breaker.

5 amps per 600 watt light.

amps = watts / volts

600/120=5 amps

i thought it was 6.5...peace

They're going to draw a bit more than 5 when they're starting up.

nice so I can connect 2 to the same breaker good I got 3 outlets on different breakers real close to my room so I don't need to run any new breakers and I can use the third outlet for my fans and shit. thanks for the responses have some rep peace.