I think thats ok for now, see what happens in a week. Then if things are going good, you could get a couple Y socket splitters and 2 more lights at least (same wattage or more). Once you flower, add a couple more... the more the better.

Do you have a fan for air circulation? I don't know how stable the plant is at the moment, but eventually you should introduce some kind of fan. This will strengthen the plant's main stalk and get it fresh air. You could put the fan blowing on the lights if they are too hot.