Blue88Comanche Posted October 18, 2016 Share Posted October 18, 2016 So my 672 watt light bar arrived today. It is composed of what should be 96 7 watt LEDs. Assuming the voltage is 12v that should put my amp draw at 56 amps. The wiring harness I have had a built in 30 amp fuse. Shouldn't that fuse blow as soon as I flip the switch? Or is it more likely I ended up with a 288 watt light bar (96 3 watt LEDs) that pulls 24 amps... The operating voltage on these lights are up to 30v switch that in mind do you think they would be brighter on a 24v system? Some pics of the light in action below This shows the brightness The panoramic photo made it darker but you can make out the area of affect it has And a comparison between my 288w and 672w bars Flood section Spot section Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
ComancheKid45 Posted October 18, 2016 Share Posted October 18, 2016 672w is crazy for a light bar, I'm pretty sure you have another variation of 288-300w setup. Link to comment Share on other sites More sharing options...
Blue88Comanche Posted October 18, 2016 Author Share Posted October 18, 2016 672w is crazy for a light bar, I'm pretty sure you have another variation of 288-300w setup. That's what I'm thinking. I messaged the seller asking for more detailed info about the LEDs used in the light bar. Sent from my iPad using Tapatalk Link to comment Share on other sites More sharing options...
Zebvance Posted October 18, 2016 Share Posted October 18, 2016 your relay should bring the current down before it gets to the fuse. Link to comment Share on other sites More sharing options...
Blue88Comanche Posted October 18, 2016 Author Share Posted October 18, 2016 your relay should bring the current down before it gets to the fuse. How so? also i mistakenly hit report when quoting this, i hit cancel so you shouldn't get flagged for anything. Link to comment Share on other sites More sharing options...
schardein Posted October 19, 2016 Share Posted October 19, 2016 The relay won't change the amount of amps flowing in the power circuit for the lights. The fuse will see whatever the load is drawing. The relay itself will draw a tiny amount when it is energized. That is through its control circuit and will not affect the main load circuit amp draw. Your math is correct. The thing to do would be measure the amp draw with a meter. If you don't have a meter for that big of a draw (not surprising), if you have extra fuses you could experiment and see what size fails. That would give you a ballpark measure. Link to comment Share on other sites More sharing options...
HOrnbrod Posted October 19, 2016 Share Posted October 19, 2016 This is another example of sellers' LED wordsmith. They never provide the individual LED lumen output, or the total amp draw in their specs. They only provide the LED watt rating because that is what everyone is used to with incandescent lights. No way this LED bar will draw 56 A. When I want to find out the amp draw of a 12VDC load that might be over the 10A limit of my multimeter, I use my battery charger as a power supply. It has a ammeter with a 100A surge capability, with a circuit breaker will trip on anything over that. The ammeter is not precision, but it will indicate the total amp draw within 25% or so and give enough info to set up your circuit. Link to comment Share on other sites More sharing options...
Zebvance Posted October 19, 2016 Share Posted October 19, 2016 your relay should bring the current down before it gets to the fuse. How so? also i mistakenly hit report when quoting this, i hit cancel so you shouldn't get flagged for anything. The relay won't change the amount of amps flowing in the power circuit for the lights. The fuse will see whatever the load is drawing. The relay itself will draw a tiny amount when it is energized. That is through its control circuit and will not affect the main load circuit amp draw. Your math is correct. The thing to do would be measure the amp draw with a meter. If you don't have a meter for that big of a draw (not surprising), if you have extra fuses you could experiment and see what size fails. That would give you a ballpark measure. Yall are correct, I was misinformed. Sorry guys. Link to comment Share on other sites More sharing options...
Blue88Comanche Posted October 19, 2016 Author Share Posted October 19, 2016 This is another example of sellers' LED wordsmith. They never provide the individual LED lumen output, or the total amp draw in their specs. They only provide the LED watt rating because that is what everyone is used to with incandescent lights. No way this LED bar will draw 56 A. When I want to find out the amp draw of a 12VDC load that might be over the 10A limit of my multimeter, I use my battery charger as a power supply. It has a ammeter with a 100A surge capability, with a circuit breaker will trip on anything over that. The ammeter is not precision, but it will indicate the total amp draw within 25% or so and give enough info to set up your circuit. Awesome idea using the battery charger, looks like i need to get it from my brother again. I got this message back from the seller Sorry about that, but pease note that 672W is the theoretical wattage, we just can get this in the ideal environment.So the actual wattage will be lower. Hope you understand this issue. Sometimes, it could be use with this wiring kit, if can't use, you may need to buy another wiring harness. For this issue, we can offer you $8 refund, would you like to keep it? Thanks for your understanding! Link to comment Share on other sites More sharing options...
HOrnbrod Posted October 19, 2016 Share Posted October 19, 2016 Sorry about that, but pease note that 672W is the theoretical wattage, we just can get this in the ideal environment. So the actual wattage will be lower. Hope you understand this issue. Sometimes, it could be use with this wiring kit, if can't use, you may need to buy another wiring harness. For this issue, we can offer you $8 refund, would you like to keep it? Thanks for your understanding! Sounds like a tap dance.............. Link to comment Share on other sites More sharing options...
Blue88Comanche Posted October 19, 2016 Author Share Posted October 19, 2016 Sorry about that, but pease note that 672W is the theoretical wattage, we just can get this in the ideal environment. So the actual wattage will be lower. Hope you understand this issue. Sometimes, it could be use with this wiring kit, if can't use, you may need to buy another wiring harness. For this issue, we can offer you $8 refund, would you like to keep it? Thanks for your understanding! Sounds like a tap dance.............. they are pushing the limits of product description, but overall I'm happy with the bar. it does what i want, it was still cheap, and i like how it looks. I'm relieved that is isn't actually 672 watts while i was prepared to run 6ga wire i wasn't looking forward to wiring it lol. odds are it has 3 watt Cree or nock off LEDs. its still puts out more usable area lighting than headlights. Link to comment Share on other sites More sharing options...
Blue88Comanche Posted October 20, 2016 Author Share Posted October 20, 2016 Installed the light bar today. And have it wired in. I love it lol Low beams High beams Light bar Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
cody4359 Posted November 2, 2016 Share Posted November 2, 2016 My 19" vision x lightbar that has just under my 10k lumens only pulls 7 amps at max. Sent from my SM-G900V using Tapatalk Link to comment Share on other sites More sharing options...
MNShanny Posted February 28, 2021 Share Posted February 28, 2021 11-11.5 Amps is what you would draw at 12 V DC. I measured my 420W led at 7.2 Amps. The LED lamp will draw 20-25% of a halogen. Link to comment Share on other sites More sharing options...
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