Will H4 LED Replacement Bulbs Work? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 7 (permalink) Old 04-30-2020, 07:53 AM Thread Starter
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Will H4 LED Replacement Bulbs Work?

I have seen H4 LED Replacement bulbs with HI/LO beam advertised on many websites and I am wondering if they will work with the HI/LO beam filament sensor on a 2006 Vulcan 750?. Is there a modification that needs to be made? Any help would greatly be appreciated. Thanks

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post #2 of 7 (permalink) Old 04-30-2020, 09:14 AM
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Most bulbs will work, the issue is that the LED bulbs use less power than the standard bulbs. Because of this the RLU on the bike thinks your low beam is out and switches to high beam causing a flicker. There is a simple mod to bypass the RLU you can search on here. The mod is putting a jumper in the wiring connector where the RLU connects and you can basically remove the RLU if you want. When bulb shopping look at the power output. I have a Sealight H4/9003 LED bulb in my bike. It’s a 40w bulb, that’s pretty high for LED, but still not enough to make the RLU happy so I ultimately removed it.

SEALIGHT H4/9003 LED Motorcycle Headlight Bulb, High/Low Beam, 6000K Xenon White https://www.amazon.com/dp/B071Z7RHYM..._XZSQEb2RYY2EE
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post #3 of 7 (permalink) Old 04-30-2020, 10:14 AM Thread Starter
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How do you ruin a rotten egg?.....You can't!
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post #4 of 7 (permalink) Old 05-02-2020, 10:26 PM
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Quote:
Originally Posted by mmart View Post
It’s a 40w bulb, that’s pretty high for LED
Its "40w equivalent", not 40w power output. 40w for an LED would be insanely bright. The LED headlights installed in my car are 1w output each (4w total with high beams on) and they easily outpower the 55w halogen sealed-beams they replaced.
Similar to how household LEDs are sold. A 26w LED bulb is marketed on the box as "100w replacement"

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Last edited by DenverDiesel; 05-02-2020 at 10:28 PM.
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post #5 of 7 (permalink) Old 05-03-2020, 09:53 AM
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Quote:
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Quote:
Originally Posted by mmart View Post
It’s a 40w bulb, that’s pretty high for LED
Its "40w equivalent", not 40w power output. 40w for an LED would be insanely bright. The LED headlights installed in my car are 1w output each (4w total with high beams on) and they easily outpower the 55w halogen sealed-beams they replaced.
Similar to how household LEDs are sold. A 26w LED bulb is marketed on the box as "100w replacement"
I don’t disagree, I don’t think the LED chips themselves consume 40w, The bulb is just one part of a “conversion kit” more or less. A lot of these bulbs have the CANbus connector in line. Now granted, I did not hook a volt meter up to it in line to measure current draw to do the math and I probably won’t at this point since it works. But point being is that the “40w” it’s marketed as is probably the total across both circuits (high and low) and this number is what you should pay attention to in our case when shopping these bulbs. Realistically, when the avg person buys household lighting and they see “100 watt equivalent” they’re taking into consideration the brightness even though lumens is the actual measurement for that, but again the avg person doesn’t care about that and is looking to cut a few bucks off the utility bill.
Fortunately household lighting doesn’t have a finicky VN750 R/R to worry about frying either
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post #6 of 7 (permalink) Old 05-03-2020, 10:59 PM
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Changing the headlight to LED won't affect the R/R.

1989 VN750
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post #7 of 7 (permalink) Old 05-04-2020, 09:10 AM
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I don’t think I agree with that. But I don’t want to hijack this thread discussing something that’s been discussed multiple times already. So to the original poster, the answer is “yes they’ll work” and best to bypass the RLU
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