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How much power do light bars use?

How much power do light bars use?

Postby tyler.stotts [OP] » Jan 05 2015, 5:02am

Just curious, If i have a 20 inch LED light bar and a 42 inch led light bar running off a car battery. How long will that battery power the light bars before it dies? I just want to know how long i can have my light bars on while my truck is off
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Re: How much power do light bars use?

Postby Mlebret » Jan 05 2015, 5:11am

My 40"is about 240W. Every brand could be different. I dont know how long that would last but im guessing not very long. I would keep the truck running. 40" is extremely bright more that is needed but it is pretty sweet to have.
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Re: How much power do light bars use?

Postby tyler.stotts [OP] » Jan 05 2015, 5:24am

yeah i have a 42 inch and just got it. I found out that battery's have use 100-200W per hour, most battery's are 1000W so if what the guy who said this is correct the light should last about 5 hours, But also depending on the life of the battery, if its full and weather. They could all change how the battery lasts so id say atleast 3 hours.
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Re: How much power do light bars use?

Postby Epyon » Jan 07 2015, 3:08am

tyler.stotts wrote:yeah i have a 42 inch and just got it. I found out that battery's have use 100-200W per hour, most battery's are 1000W so if what the guy who said this is correct the light should last about 5 hours, But also depending on the life of the battery, if its full and weather. They could all change how the battery lasts so id say atleast 3 hours.


Most DC batteries have an Amp-Hour rating. If you know the wattage of the light, you can divide by 12 volts to get the amps it draws when it's on. So 200W/12VDC = 16.6 Amps. Several 660 CCA Truck batteries average 95-120min reserve capacity, which is about 40-50 AH. So if your 200W light is pulling 16.6 Amps (at 12 Volts), your battery would be dead in a little over 2 hours.

Hope this helps.

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