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Don't forget to check that the light emitting part is at about the same distance from the back of the reflector. The reflectors for conventional bulbs assume that the light comes from a small filament and in optical terms they'll consider it to be almost a point source, so the way it reflects light will change if the source moves. This will also change the way the lens modifies the light into a pattern on the road.
Too far back and you loose some light due to the optics of the reflector. The bright area on the road dims in the centre and the overall lit area increases in size but reduces in overall brightness.
Just right and the reflector works. That's going to be 25-30mm from the back of the reflector.
Too far forwards and again you loose some of the light due to the optics of the reflector. The bright area on the road is smaller along with the outer lit area.
So there might well be some gains to be made by shifting the bulbs position if it is longer than a conventional H4.
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"The final measure of any rider's skill is the inverse ratio of his preferred Traveling Speed to the number of bad scars on his body." Song of the sausage creature
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