There are a couple of other threads discussing the same thing. Using a Pathfinder LED with no ballast to install. Output is 2000 lumens and 6000 kelvin temp. The best thing about it is it fits in the small stock 5 3/4" sportster headlight casing.
LED in my stock headlight lens. Need to remove the rubber boot.
ddmtuning.com, i got their single 55w in 6500k kit for $35 a few years ago and have not had a single issue, plus they have a lifetime warranty. I mounted my ballast on the front of the frame just above the horn under the steering neck. I'll have to take and post some pics once i figure out my wiring issue related to my handlebars