Since this is heating up I'll chime in*. (the goal is to learn stuff from each other, right?)
First, I have experience in the matter. I built custom Slingshots (and other vehicles), but the Slingshots' lighting flat out sucked so have the most experience changing those around.
Second, I'm really sensitive to people changing out their bulbs and thinking they're brighter and help the driver see better (which in reality may or may not be the case under varying conditions), the reason being most often the changes blind drivers in the opposing lane. Here is one such writeup (I made multiple posts on the subject):
Which one is the best. Not a big deal now..... Because nobody has them in stock!!!!
www.slingshotforums.com
Third, I had a factory race truck built in Japan and shipped to the U.S. with the first ever factory LED headlights, and that sucked. I could be 1/4 mile away from a freeway sign and the reflection was so bright it blinded me and everyone else. If I was behind a car their interior was light like daylight and I could see everything in their car. It was crazy. Most people don't understand lighting physics and how the human eye works--and it shows. (Admittedly, there's a lot to it.)
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Okay, with that said, it can be done. I've modified Slingshot lights in my shop and measured the beam cutoff and adjusted them properly. Often the puddle (the light right in front of the vehicle) is too bright and ruins the driver's long-distance perception, but with the right bulb in the right location it can be done. LEDs, while they look cool, tend to suck. The reflection is too bright off of reflective things and nonexistent off of things that absorb their wavelength, like wet grass and deer. Black Body Regulators are far superior.
Regarding the Fury, I have a HID in my headlight with the stock reflector and it works perfectly, including casting the
phoenix (link from the 1st Fury's stock headlight). So again, it can be done properly and with good outcome, but care must be taken.
BUT, with that said, it's a pain in the @$$. Seriously. I usually just go buy a reflector that is specifically made for whatever bulb I want to use. I only mess around fitting stuff when the reflector won't fit the housing it needs to work in.
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So, if you're going to do this, and I suggest you don't because it's a lot of time, money, learning, and effort to get right, find a super-flat area somewhere and with the stock bulb first adjust the stock headlight so it's not blinding oncoming traffic--actually get a friend to sit on your bike and go walk around at different distances and put your head at the height of a short person in a car and see what it's like (imagine you're 70 years old with nigh vision problems, because that's going to hit you if you get this wrong). You also have to watch the spill (the amount of light on the left and right). Go walk all over and figure it out--and do it every night for a week, because you really need to understand this. Also look at exactly what your headlight causes to light up and how.
Then, when you do change out your bulb, go repeat the process and make sure you're not going to blind that 70's granny, or anyone else, anywhere else, including side street people wanting to make a turn, because you don't want them turning into you. Keep doing that until you get it right. It takes me about 6 different bulbs to figure it out, depending, so expect this to be a bunch of work. If it's not a bunch of work you've not put in the effort to ensure you did the job right, you're probably a hazard to others, and you shouldn't be on the road. Seriously, do not endanger others, that's completely and totally wrong. In the big picture from someone else's point of view, it's a headlight, on one of the several vehicles you own, and certainly not worth risking someone else's life over.
J.W. Speaker is close to where I work and I also know someone who works there. They really strive for quality, and when I last looked they made great, reliable lights (except for that one that detected lean angle--they had to recall that one, though that was years back when it first came out). I looked at replacing the Fury light with one of theirs, but honestly I like the phoenix too much. I do know a bunch of Harley guys love them, and I also know some Harley guys who bought Chinese knock-offs which are probably 80% as good at 1/5 the price. If you want a light almost no other Fury owner has, get a
J.W. Speaker.
Otherwise,
SLK Customs has a light, I believe you can even
get them on Amazon, and for $100 or so that's probably the best performance for the price.
If you need a powerful high-beam, you
may want to spend extra money on a J.W. Speaker, though your install may not be nearly as easy depending on what you get.
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Super-long post, but the Fury headlight sits high and you need to know this stuff before you go messing with it so you don't get smucked by another driver, the law, or injure others.
--Hedge
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* Note this post is not targeted at any particular person/persons. Changing headlight bulbs usually becomes heated if it goes on for long enough, just like the bulbs.