This is my first post, and I am a journeyman electrcian. your 1000w lights will pull about 8.3 amps each. 1000w/120v = 8.33
Breakers are sized to trip at 80% of their rating. So technically a 20 amp breaker should trip at 16 amps, and a 15amp should trip at 12amps.
At 220v your lights should pull around 4.5amps. However it is unlikely you want to switch your feed to 220 as it would change every
plug or light on that circuit to 220v and wreck alot of your shit.
Houses typically have 14guage wire pulled through them, and commercial buildiings 12 gauge. 14 guage is good for 15amps, thus you should not have
any breakers larger than 15amps in your panel. In addition, whoever gave the advice to throw in a bigger breaker was wrong, and the advice
to leave your breaker alone as it is sized to your wire is dead on. Also it is good advice not to run a breaker at its max. Wires can carry
more ampacity than they are rated for, but they are rated as such to stop fires =)
As far as motors are concerned, 1hp = 746watts. so essentially, every hp= 6.22amps at 120v.
Finally, you should definetly consider getting some help from an electrician. The good news is, you should be able to work a trade out
pretty easy, as pretty much every sparky i know, lights up. A shop is going to charge you quite a bit to be honest, but might be your
only bet.
Another route to go would be to call up some local shops, ask them how much to change out an outlet, look for the ones that are cheap
and when the service electrician comes out, leave a little bit of smoke smell around and see if he perks up. If you find one that likes to
smoke (should be like fishing for minnows at the bait store) see if he would do some trading. If you can trade for services, you can
get your dream grow room at a fraction of the cost.
Hope that helps