Despite LED light bulbs being the most efficient light source available using way less power than incandescent light, it is still important to calculate how many LED lights can be safely used on a lighting circuit.
The number of LED lights that can be installed on a single circuit requires two simple calculations.
You need to know following information:
To determine the total wattage of lights that can be accommodated, use the formula:
watts (power available to be used) = Volts (voltage of the lighting circuit) x Amps (capacity of the circuit breaker)
For example in the USA using a 5 Amp circuit,
Total capacity = 120V*5A = 600 Watts
Then to estimate how many LED lights can be safely installed on a single circuit, check the wattage of your bulb and use the formula:
Number of LED lights = Maximum circuit wattage / LED Watts rating
A 60W incandescent bulb equivalent in an LED bulb is rated at 8.2W
600W/8.2W = 73
Therefore, a 120V 5A circuit can accommodate up to 73 8.2W LED bulbs.
However, even though it is unlikely so many bulbs would be used on such a circuit, a derating of 80% should be used to ensure the circuit is run under maximum capacity.
Therefore, the number of LED bulbs is reduced to 58
Always check the circuit breaker is off when installing new light fixtures to avoid hot wiring LED components and even potential electrocution.
If you are using other types of light source, we look at how many lights can I use on a 15 amp circuit.
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