Power (watts)/Voltage (volts) = Current draw (amps)

For example, with a 1000 watt light unit: 1000 watts divided by 110 volts would equal a current draw of 9.09 amps. (Although power supplies can vary from 110 to 120 volts, assume the smaller 110 volt supply in your calculations to decrease the possibility of underestimating your needs and blowing a fuse.)

You would add the current draw of all of your light units together to determine your total current requirements.

If your circuits are protected by circuit breakers, rather than fuses, be aware that, over a period of time, a circuit breaker will carry only 80% of its rated load without tripping. For example, a 15 amp circuit breaker will carry a 12 amp load; a 20 amp breaker a 16 amp load. While they might carry a heavier load for a time, after a period of hours the larger load would cause the breaker to trip. To avoid the inconvenience of a "blackout", stay within this 80% limit when calculating your requirements.

Also, remember that different receptacles are not necessarily on different circuits. You need to know what circuit your various receptacles are on before you begin to use your lights.

Light Unit Wattage Power Draw 250 2.27 amps 420 3.82 amps 500 4.55 amps 600 5.45 amps 650 5.91 amps 750 6.82 amps 1000 9.09 amps

Kit Wattage Power Draw 1000 9.09 amps 1200 10.9 amps 1250 11.36 amps 1500 13.63 amps 1800 16.36 amps 1900 17.27 amps 2500 22.72 amps 3000 27.27 amps 4000 36.36 amps