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    Home / Education / How many LED grow lights can I run on a circuit?
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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 oflights that can be safely run on this circuit:



    Standard Circuit Maximums

    Circuit Breaker Amperage Rating Maximum Safe Total Amperage Maximum Safe Total Wattage
    100V 110V 120V 208V 220V 230V 240V 277V
    10A 8A 800W 880W 960W 1664W 1760W 1840W 1920W 2216W
    15A 12A 1200W 1320W 1440W 2496W 2640W 2760W 2880W 3324W
    20A 16A 1600W 1760W 1920W 3328W 3520W 3680W 3840W 4432W
    30A 24A 2400W 2640W 2880W 4992W 5280W 5520W 5760W 6648W

    PhytoMAX-4 Lights Wattage and Amperage

    Light Wattage Voltage
    100V 110V 120V 208V 220V 230V 240V 277V
    PhytoMAX-4 2S 125W 1.3A 1.1A 1.0A 0.6A 0.6A 0.5A 0.5A 0.5A
    PhytoMAX-4 4S 250W 2.5A 2.3A 2.1A 1.2A 1.1A 1.1A 1.0A 0.9A
    PhytoMAX-4 8S 500W 5.0A 4.5A 4.2A 2.4A 2.3A 2.2A 2.1A 1.8A
    PhytoMAX-4 12S 750W 7.5A 6.8A 6.3A 3.6A 3.4A 3.3A 3.1A 2.7A
    PhytoMAX-4 16S 1000W 10.0A 9.1A 8.3A 4.8A 4.5A 4.3A 4.2A 3.6A
    PhytoMAX-4 20S 1250W 12.5A 11.4A 10.4A 6.0A 5.7A 5.4A 5.2A 4.5A
    PhytoMAX-4 24S 1500W 15.0A 13.6A 12.5A 7.2A 6.8A 6.5A 6.3A 5.4A

    PhytoMAX-3 Lights Wattage and Amperage

    Light Wattage Voltage
    100V 110V 120V 208V 220V 230V 240V 277V
    PhytoMAX-3 2S 100W 1.0A 0.9A 0.8A 0.5A 0.5A 0.4A 0.4A 0.4A
    PhytoMAX-3 4S 205W 2.1A 1.9A 1.7A 1.0A 0.9A 0.9A 0.9A 0.7A
    PhytoMAX-3 8S 410W 4.1A 3.7A 3.4A 2.0A 1.9A 1.8A 1.7A 1.5A
    PhytoMAX-3 12S 615W 6.2A 5.6A 5.1A 3.0A 2.8A 2.7A 2.6A 2.2A
    PhytoMAX-3 16S 815W 8.2A 7.4A 6.8A 3.9A 3.7A 3.5A 3.4A 2.9A
    PhytoMAX-3 20S 1020W 10.2A 9.3A 8.5A 4.9A 4.6A 4.4A 4.3A 3.7A
    PhytoMAX-3 24S 1220W 12.2A 11.1A 10.2A 5.9A 5.5A 5.3A 5.1A 4.4A

    PhytoMAX-2 Lights Wattage and Amperage

    Light Wattage Voltage
    100V 110V 120V 220V 230V 240V
    PhytoMAX-2 200 210W 2.1A 1.9A 1.8A 1.0A 0.9A 0.9A
    PhytoMAX-2 400 420W 4.2A 3.8A 3.5A 1.9A 1.8A 1.8A
    PhytoMAX-2 600 630W 6.3A 5.7A 5.3A 2.8A 2.7A 2.6A
    PhytoMAX-2 800 840W 8.4A 7.6A 7.0A 3.8A 3.7A 3.5A
    PhytoMAX-2 1000 1050W 10.5A 9.5A 8.8A 4.8A 4.6A 4.4A
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    Black Dog LED

    1120 Delaware Ave.
    Longmont, CO 80501

    720-420-1209
    800-380-2291
    Office Hours:
    M-F: 9 am - 5 pm
    M-F: After 5 By Appointment
    Sat - Sun: By Appointment

    Products
    • PhytoMAX-4 Grow Lights
    • Accessories
    Our Technology
    • Unique Science Based Spectrum
    • Superior Yields
    • Case Studies / Testimonials
    • Leaf Surface Temperature
    Education
    • Home Growing
    • Commercial Growing
    • Spectrum / Color
    • Light Measurements / Comparing Lights
    • Product Design
    • Deployment / Installation
    • All Categories
    Quick Resources
    • Growing 101
    • Galleries
    • Growing Calculators
    Black Dog LED

    1120 Delaware Ave.
    Longmont, CO 80501

    720-420-1209
    800-380-2291
    Office Hours:
    M-F: 9 am - 5 pm
    M-F: After 5 By Appointment
    Sat - Sun: By Appointment

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