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I'm going to be building my second dynamo as soon the LEDs and optics arrive. This one is going to going on a Pugsley. In the winter the snow provides a lot of light, so a bright light isn't all that necessary when spinning 22-34 in 6 inches of snow. But I do do some trail riding and lower speed things and I will be using the bike all year.

I was curious if it is worth it to do circuit 10 from http://www.pilom.com/BicycleElectronics/DynamoCircuits.htm or if I should just stick to circuit 7 like my other light and not worry about it. The Endomorph is a larger OD tire than my other light, so it may take a little more to get the hub up to speed. I will be using 4 Cree LEDs.

Also, if doing circuit 10 is a good idea what switch should I use and where can I find one? I wouldn't mind incorporating a third off position, but finding a 3PTT switch is a bit difficult.
 

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Its useful to have a dimmer if for no other reason than it lets cars know you're not highbeaming them.
Certainly with 4 LEDs you'll need a doubler for the boost on steeper hills.

I got my switch from farnell, couldn't find one in the local shops.
 
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