You will draw about 9 amps per light. What we did was to run a separate box off the main breaker, and bolt the box next to the original on the wall. You have to tap directly into the hot main line to do this, and I don't remember or want to specify the details, because I had help. Suffice to say it is the one line that comes in through the wall from outside, and is always hot (unless shut off from the pole). You have to run a main, thick gauge wire from this to your extra box. That box we wired with 2 switches. Both were doubles and carried 20 amps a piece, for a total of 80 amps of reliable, safe power. From these breakers, through the ceiling, you run your (I believe) 20 gauge, or is it 10...well suffice to say, look up what gauge you want to carry 20 amps per line safely.
This line is going to run to your grow area, where you will install outlets, one for each line. Therefore each outlet will reliably carry 20 amps, or ten per plugin (assuming two plugins). This should be enough to run 2x 1kw lights off each outlet, with a margin of safety of 1 ampere.
This is pure analogy and is hypothetical. But it may help.
This is the safest way, but you must know what you are doing, for there is risk of electrocution. It is best to do on your own though, just read up first thoroughly, maybe buy insulated engineers gloves....