Join Date: Apr 2002
Location: Montréal (Québec)
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You could do it, but it's a bit tricky. I suggest that you read Peter White's pages
on lighting (look for "Secondary" Lumotec and E-6) and to the wiring instructions
. Most of what he writes is also true for the Shimano generators.
A few things to note.
1. The lights need to be fed in series, not in parallel.
2. For the secondary, you need the special "secondary" headlight which is wired differently. When you turn the Secondary OFF, you actually short it. Alternately, you might install an unswitched headlight, except it will always be on when the main one is on, and it won't be bright until you reach 18-22 km/h.
3. Because the Shimano hub is not insulated, you'll need to insulate the Secondary light: i.e. install it on some kind of plastic bracket.
4. Depending on where you ride, you might get equally satisfying results by replacing your current Lumotec with a Schmidt E-6 headlight. It's expensive, but it's an awsome upgrade.