It's finally time I got off my lard arse and did something with the aspherics I got from Ash last year and was wondering if anyone that has them could chime in with what sort of gap they have used from base of aspheric to top of star to give a punchy, fairly tight helmet light? From memory I'm thinking around 5 - 6 mm seemed to be good but haven't had much luck with the MTBR search.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: ahortons aspherics