This guide will help you determine your electrical current requirements as you prepare to use your SmithVictor lighting kit. You can calculate the amount of current your light unit will draw with this formula:
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 

