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Bulb is replaced by itself but requires some work.
Placement of the bulb is hard but critical for max throw. Just a little off and you get a little flood. Hard to play around with stock bulb to tweak it as you may break the bulb. No way to easily shim with washers as bulb is potted in with high-temp silicon type glue. You have to dig that out to re-bulb also. Hard as heck for factory to get bulb exactly right as most units I saw have a little variation in beam pattern... Get it right and it makes a whole lot of difference...
You can see silicon around red wire that goes into bulb holder in back of reflector
Bulb wire attaches to this connector then siliconed in
Return wire attaches to reflector with pinch clip here. This is the wire that goes through small hole in reflector
Black ring screws bulb assembly into reflector. I haven't had time to play with it but you could possibly work out a shimming forward or back to get optimum focus in the reflector that makes a nice difference in throw... Not as simple as screwing tighter or loosening to adjust focus as if you loosen bulb will be loose and not seated all the way...
Bulbs (Should last a long time unless you break one...