Grand Prix 250
Main Motorcycle: T100 50th Anniversary LE
Join Date: Sep 2016
Location: Koh Samui, Thailand
|Air Cooled Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, Bobber, T100, Speedmaster, America, Thruxton, and Scrambler.
Sponsored by: Triumph Twin Power Ltd
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Put in a very good American-made DCX headlamp lens-reflector unit ($139), pic attached, which compared to any H4 lamp will give a large improvement in terms of more light within the beam, a wider spread, and longer down-the-road seeing distance, with better lighting even when you're banking into turns. You'll need an adaptor pigtail to be able to plug this lamp into your bike's socket, that adaptor is $17. Put a cherry on top by installing a premium bulb, which I don't sell but this is the one: https://www.amazon.com/dp/B00U1OLOP0/?tag=2402507-20
The reason why this lamp is a considerably better pick is that the H13 system uses the entire reflector surface area to gather, amplify, and focus light for the low beam, while the H4 system uses only half. You can see this for yourself if you turn on the low beam and look at the operating headlamp; the lower half of the reflector is dark. The beam pattern of the DCX lamp is very well suited for motorcycle usage; it is symmetrical and does not have a super-sharp low beam cutoff which would tend to make your seeing distance go to zero when you bank into a curve. Note the new lamp does not have a provision for the parking light function presently provided by the miniature bulb located a short distance away from the main bulb in your headlamp. That function and that bulb are superfluous in North America where motorcycles are not required to have a parking lamp function because the headlamp is illuminated whenever the engine is running. The parking lamp function is a (mostly obsolete) requirement in certain European countries; Triumph just chooses to equip all their bikes regardless of destination. When you're in there replacing the lens/reflector unit, simply fold the parking light wire back and tape it off.
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