Yes you need some fabbin skills here, soldering is still molten metal
There are two categories when talking LED's those under 1watt and those over 1watt or high power LED's. I going to try and cover more about the high power LED's and the designs needed to make them run for max light.
I added links to key words if you what to look at more details.
With that said the brightest LED out there is the ( Edit... wait somebody put 4 on the star board for 900 lumnes OUCH)
Endor Star ( Hey I not taking some billion cluster crap, but stuff us 4x4 guys can use) Here's a term you will needed to know.
lumens
The 55 watt tractor light we all love and hate produces 1475 lumen's with a life of 675 hours. data taken from this
site "I bought some horns from them too"
Now what the H3 manufacture did not tell us is a lot of light can be lost in the design the fixture. That's why some nice big Hella lights cost like a
$100 and some Harbor Freight version are
$10 bucks a pair and both use the H3 bulbs.
specs on the Endor Star. from this
site
End product for reference. notice this has an LED driver, heat sink and fan. read more
here
The biggest killer of an LED is heat. Unlike the incandescent bulb which projects a lot of heat energy out, these LED's don't produce any infrared light (heat) so all the heat is generated at the base of the LED. But it a fraction of the heat created by the tractor light.