Question 1

Has anyone tried this bulb on an BMW G650GS?  I am a bit concerned it might fry the wires, reflector or lens.

Accepted Answer

You MUST use 12g stranded wire with quality insulation to each h4 socket terminal.  You MUST use Ceramic High Heat HD socket.  You Must usea relay that is 20% Higher rated than the max amp draw.  Your altenator or generator must have the added capacity so to cover the increased draw@ idle of these lamps or they will draw down the battery.  If smaller wire or alt capacity there will be voltage drop which increases amp and thus heat.  For 1 light on a bike figure for 13.5v to be safe which adds to 9.6 amps.  Use a 15 amp relay.  For high low you need 2 relays use two 15a or 1 15a hi and 1 10a lo.  If its 2 for a dual lamp or 4wheel vehicle double Watt   so 260w÷13.5=17a.  Best use 25 or 30a relay for high and low.  Ideally use a dual output relay so 1 12g lead to each bulb from  relay term not daisy chained.  Ideally run 10g from battery or alt post to relay input.  Built like this you will never have a capacity or heat issue when in good condition.

YOU CAN NOT USE ANY STOCK WIRING HARNESS!!  NOT EVEN MOST PREBUILT HD WIRING HARNESS.

If you follow the above general guide with properly crimped connectors it will not only not burn up but 2
Will have much higher light output.  Remember a 5% drop in voltage = a 15% drop in light output 1:3 ratio. Ideal voltage is 14.5V on 12v systems.

Question 2

I have an original stock headlight.  Anything special i need to do to use this bulb?

Accepted Answer

The current draw with this bulb is more than stock so after having the lights on for say a 30 minute drive in warm weather see if the connector at the bulb is hot as well as the wires going to it with the lights still on if so you should install a hevi-duty  connector and wire kit. My jeep 2005 wrangler handled these bulbs just fine and I think most vehicles will need nothing.....DBW

Question 3

I have a 1998 Kawasaki Vulcan 800 Classic. Any need to upgrade anything electrical or does this simply replace the stock bulb? Thanks

Accepted Answer

Oh yeah. You should not just plug this in and go. These bulbs make a ton more heat than a stock 55/60 bulb. Buy a ceramic plug as well, otherwise the stock pug will just melt over time. I think I paid maybe 12 bucks for 2 ceramic H4 plugs on Amazon.

Question 4

Will these work on my motorcycle? it's a 2004 bmw r1150r, and h4 is stamped on the glass plate of the light housing

Accepted Answer

The h4 bulb will fit, May want to check the wattage they get kind of hot. There is a lower watt bulb too I believe.

ASIN	B078SGR4SY
Auto Part Position	Front
Best Sellers Rank	#140,878 in Automotive ( See Top 100 in Automotive ) #640 in Automotive Headlight Bulbs
Brand Name	Hella
Customer Reviews	4.6 4.6 out of 5 stars (543)
Fit Type	Vehicle Specific
Global Trade Identification Number	07502278672291
Included Components	Bulbs
Item Type Name	High Wattage H4 Bulbs, 12V
Item Weight	1.76 ounces
Manufacturer	HELLA
Manufacturer Part Number	H4 100/80WTB
Manufacturer Warranty Description	1 Year Limited
Model Number	H4 100/80WTB
Number of Items	2
Package Quantity	1
Specific Uses For Product	Fleet and plant maintenance.
Unit Count	2 Count
Voltage	12 volts
Wattage	80 watts

HELLA H4 100/80WTB High Wattage Bulbs, 12V

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