How many amps does a 120-watt light bar consume?

To get that number, you need to divide the wattage by the voltage. For example, 120 watts divided by 12 volts gives 10 amps. If you plug the light bar into the VAC, you divide 120 by 120 to get 1 amp.

What do you need to know

Your decision to go LED was a good one, but now you might want to know a few things. Here are some of them.

Also read: 3-wire LED light bar - White, blue, black - What is each wire for? Read this article about garage lighting with 4-foot LED fixtures.

Polarity is important

In electronics, polarity indicates whether your circuit components are symmetrical or not. LEDs are diodes, which means they allow current to flow in a single direction. If no electricity flowed, there would be no light.

Fortunately, this also means that LEDs can't be damaged by back plugging.

LEDs have a positive electrode, commonly called an anode, and a negative electrode called a cathode. Current always flows from the anode to the cathode. Never go the other way. Therefore, a reverse LED prevents the entire circuit from running because it prevents the current from flowing.

Don't panic if adding leds will disconnect the circuit. Instead, flip it.

Molar current is the same as molar light

The brightness of an LED depends entirely on the amount of electricity it consumes, which means two things. First, extremely bright leds drain the battery more quickly because the extra brightness comes from the extra power used.

Second, LED brightness can be controlled by adjusting the amount of electricity used.

Too much power is one thing

What happens when you connect an LED light bar directly to a current source is that the light bar will dissipate as much power as possible. Of course, too much of something is never good, and it may eventually get damaged.

This is why it is necessary to adjust the amount of electricity flowing through the light bar. To do this, you need to use a resistor.

These control the current flow in the circuit and protect your LED light bar from consuming too much current.

The best part is that you don't need to do complicated math calculations to get the best resistance value.

Bottom line

We've already answered how many amps a 120-watt LED light bar consumes under normal conditions, but as you can see, the light consumes as much current as possible, which can cause damage to it, and then all you have to do is adjust the current that can be drawn.

You can find more details below these articles:

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