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Hello.
LED lighting for off-road trail bike (motorcycle) headlamp. Not licensed for road use.
INPUT
4vac~ 16vac magneto output depending on RPM. Maximum 28watts.
OUTPUT
... three XMLBWT-00-0000-000LT50E4CT SMD LED
http://www.digikey.com/product-detail/en/XMLBWT-00-0000-000LT50E4/XMLBWT-00-0000-000LT50E4CT-ND/3770886
Please advise as to...
Schottky diode bridge
Smoothing capacitor (if necessary)
Boost/Buck converter....
... appropriate to drive these leds most efficiently.