I am unable to find what I want searching....for some reason I can't remember what you are all calling the brim/lip/cap on a road bar light that cuts off the beam on top of a housing. Have I described this well enough, probably brain fart on my part.
I am getting ready to cut a housing for a bar light for commuting and wanted an upper cutoff for the beam and wondered how long the 'brim' should be to be effective.
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Thread: "brim"(?) length?