I replaced my motolights (fork mount, not caliper mount) because when they were aimed for good daylight conspicuity I had to turn them off at night or when riding in the fog. I was using the amber bulbs which are only available in 50 W with a 12° beam spread. Perhaps that was part of the problem.
If you only ride street a caliper mount is probably fine. If you ride dirt make sure that the lights wont cause damage to the bike if you happen to hit something hard.
// marc
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