Maximum wattage for a light bar?
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    Maximum wattage for a light bar?

    I'm looking to install an LED light bar on my ROPS. I see from other threads that I'll want an approx. 20-24" light bar. My question is, how much wattage is "too much" for the electrical system for the 1025R? Going with the philosophy that "you can't have too much light," they have a 20", 420W light bar that puts out 42,000 lumens:

    Amazon.com: Nilight 18024C-A 20Inch 420w Triple Row Flood Spot Combo 42000LM Bar Driving Boat Led Off Road Lights for Trucks,2 Years Warranty: Automotive

    I'm not familiar enough with the electrical system on cars/tractors to know if it's "too much". They also produce 360W, 288W, 216W, etc., so I'm feel somewhat spoilt for choice without knowing which of the options are realistic for the 1025R.

    Thanks in advance!

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    Watts divided by 12 equals your amps. In this case your 420 watt light would be 35 Amps. I am not sure what size alternator you have on your tractor.
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    Quote Originally Posted by HVACguy View Post
    Watts divided by 12 equals your amps. In this case your 420 watt light would be 35 Amps. I am not sure what size alternator you have on your tractor.
    Details says it's 160 watts , so using your formula is around 13.33Amps
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    I find it hard to believe that light draws 420 watts. Often with LED lights they list the equivalent brightness in watts. Consider the home LED bulbs that are 60 watt equivalent and draw just a few watts of electricity.

    I tend to think that the 160 watt/13.3 amp numbers are more accurate for what this light draws. Looking around at some other brands, I see LED light bars that are twice the size but don’t draw anywhere near 420w.

    I think the “420w” is intended to indicate equivalent brightness rather than current draw.

    My 2 cents.
    Last edited by brownalan; 05-17-2019 at 07:59 AM.
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    I’m running a 145W, and two 18W lights, plus an LED beacon. I think I measured 4.5A all told. Obviously they rate the wattage as equivalent brightness to an incandescent light. Plenty of light, turns night into day.

    The cigarette lighter socket is rated for 10amps. I’ve burned out a few plugs drawing less than 5A continuously, and once got burned by touching the contact. I’d say it is too much, and not necessary anyways.


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    Jonathan

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    If you are concerned that there is too much draw, there is an easy fix, use a relay. A relay will isolate the power draw from the switch and other easily damaged items. Essentially your switch will turn the relay on and off rather than the light. The relay will then interpret that one/off and feed juice to the lights as needed. Cost of a relay is about $10. I've included some simple wiring diagrams that I used to put Aux lights on my 1026r with a relay which wasn't necessary, but gave me comfort (file under doing it right the first time). The last one includes separate switches for aux lights and a rear work light.
    Attached Thumbnails Attached Thumbnails simple_relay_circuit.JPG   LightSchematic-1.jpg   Aux Light wiring.jpg  
    Last edited by Ransx77; 05-17-2019 at 11:33 AM.
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    If you simply want to tie that light bar into the existing work light circuit that is already there in the harness it is a 20 amp circuit for the 1 series work lights.
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    Q&A section says 8 amps; sounds about right, but my math also came up with 13A.
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    Quote Originally Posted by 9MMMAC View Post
    Q&A section says 8 amps; sounds about right, but my math also came up with 13A.
    I tested similar lights, they were much lower than I expected. I think the “144W” one came in at 2.7A, if memory serves...


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    2016 1025R FITLB : OTC (winter only) : AF10F front blade : Titan 42" forks : 60" First Choice RFM : KK 48" Tiller : EA 60" Pine Straw Rake : 60" Landscape Rake : Pat's Hooks : HH w/ 12 42# weights : KK Ripper/Potato Plow : Loaded Rears with 50# weights : Ken's Hooks, springs and straps : HH Tooth Bar : Edge Tamers : BXPanded 6" bucket w/coupler
    2014 X320 : Johnny Plow/Johnny Bucket : Bagger

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    SRG
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    Curious why you want/need that much light on a 1025? I have a 120w, 16" 2 row light bar on the front bumper of my Jeep, and it's really bright. No problem lighting up a path at the Dunes. It's not the brightest but it gets the job done for sure. 40 some thousand lumens is a butt load!

    With light bar on and with headlights only. HUGE difference!
    Attached Thumbnails Attached Thumbnails IMAG0625.jpg   IMAG0626.jpg  
    Last edited by SRG; 05-17-2019 at 01:21 PM. Reason: Added pics
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