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How many LED grow lights can I run on a circuit?


The answer depends on what size lights, what voltage the circuit is, and what the circuit breaker's amperage is. It is important to never overload your circuits with too many things plugged into them, as the wires can overheat and create a fire hazard, or the circuit breaker can trip and cut power to important equipment in your grow! If you have any doubts, you can consult a local electrician for help.

If you are unsure what voltage you are running at, please see our helpful grow light electrical circuit guide.

When determining how many lights can be run on a circuit, it is important to also account for all other electrical appliances plugged into the same circuit! Add up the wattage of everything plugged into the circuit and divide by the circuit's voltage to determine the total amperage draw on the circuit. This amperage must not exceed the safe level for the circuit: 80% of the total rated amperage of the circuit breaker. Only 80% is safely usable because some electronic devices (including our lights) can pull a bit more power than normal when they first turn on.

Lights Per Circuit Calculator

Circuit breaker amperage rating:
Circuit voltage:
Total wattage of other electrical devices on the circuit: watts

Total number of lights that can be safely run on this circuit:

Or, if you want to run a mix of different lights on this circuit, enter the number of each below:
PhytoMAX-2 200 lights:
PhytoMAX-2 400 lights:
PhytoMAX-2 600 lights:
PhytoMAX-2 800 lights:
PhytoMAX-2 1000 lights: 




Standard Circuit Maximums

Circuit Breaker Amperage RatingMaximum Safe Total AmperageMaximum Safe Total Wattage
100V110V120V220V230V240V
10A8A800W880W960W1760W1840W1920W
15A12A1200W1320W1440W2640W2760W2880W
20A16A1600W1760W1920W3520W3680W3840W
30A24A2400W2640W2880W5280W5520W5760W

PhytoMAX-2 Lights Wattage and Amperage

LightWattageVoltage
100V110V120V220V230V240V
PhytoMAX-2 200210W2.1A1.9A1.8A1.0A0.9A0.9A
PhytoMAX-2 400420W4.2A3.8A3.5A1.9A1.8A1.8A
PhytoMAX-2 600630W6.3A5.7A5.3A2.8A2.7A2.6A
PhytoMAX-2 800840W8.4A7.6A7.0A3.8A3.7A3.5A
PhytoMAX-2 10001050W10.5A9.5A8.8A4.8A4.6A4.4A