Join Date: Apr 2009
Location: Smugglers Notch, Vermont
Bikes: Upright and Recumbent....too many to list, mostly Vintage.
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Dynamo powered Cree LED's electrical Q's
I'm looking at parts to build myself an LED headlight to be powered by a Sturmey Archer Dynamo hub. The hub is rated at 3watts at 6V. I was thinking that I'd use a single Cree MC-E as the main headlight. It provides 430 Lumens at 350mAh.
I have some knowledge of electrical circuits, but this is my first try with LED's
Please correct me if I'm wrong.
My idea is to simply wire the LED to a 350mAh buckPuck or similar and plug that into my Dynamo hub.
My question is regarding adding more light. When I want to add more LED's (for taillights lets say), Am I better off to wire the taillight up to its own driver and run two connections out of the Dynamo, or is it best to get a driver that has some room to grow and add on to that?
I'm also getting confused trying to calculate the total forward voltage of the system if I were to use 2 or 3 LED's on one Driver. All I can figure is that I'd need a boost driver rather than a buck, but I'm not sure whether the 3watts my hub can put out will be sufficient for that.
any help is much appreciated.