You get your amps from Watts/Volts....you can run up to 15 amps on most house circuits (120v) so thats 1800 watts. Your ok...most irons run like 1300 watts or so. That setup of lamps will put you at 13.3 amps...maybe a little more when you first start them up. You do risk blowing a fuse starting all the lamps at once, either start them apart or use a different circuit for a 600.