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Lights for a bottle dynamo are different to those for a hub dynamo yeah?
Not really - they both want 6V, so the only real difference is that you switch off a bottle dynamo by moving it away from the tyre, while with a hub dynamo you either need a switch on the light, or to leave it on all the time.
Yes, I do believe 6V for that hub. The 3v ones are a funny shape and generally black, and have MTB branding like 'LX' and such like.
There aren't any 3V hub dynamos AFAIK - they're all 6V, whether they're LX, XT, Alfine or go under model numbers like 3N80 (Shimano, obviously, but the same applies to SP and SON models).
Most of them will output 3W (still 6V), but some are designed to put out less power (there's a range that only output 1.5W, while some of the hubs like the SP SV-9 or SON Delux can't be sold as 6V3W for 700c wheels, as they only reach that output above the threshold speed set by the German standards (they're designed to hit the output under the threshold when built into small wheels, which rotate faster for a given road speed)).
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jsabine
@M_V
I've just bought a bottle dynamo to fit to my shopper/beater/deep winter commuter bike. Need lights now.
Lights for a bottle dynamo are different to those for a hub dynamo yeah?
Edit: There are sets (inc a bottle dynamo but the one I've bought is a bit nicer so will be using that) on ebay for £9. Given that bottle dynamos will be relatively inefficient compared to a hub dynamo, is there much to be gained by spending more than this on lights for it?