Look on the fixture. I think 1ks are about 6 amps and 600s are around 4 amps. You have to find your breaker(s) that controls the power to the room. You should only use 75% of what the breaker says. It might be as low as 10amps but usually 15, but sometimes 20 if you have thick wire installed. Thats what governs what you can put through as far as max amps goes.
If your screwed you can always run extention cords through attics and most power strips and cords are good for 15 amps.