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I read into this a bit as I could have gone for the 1.5w Alfine hub.
Internet wisdom suggested that a 1.5w hub will have a little less resistance than a 3w hub but that in reality the difference was so negligible it would be impossible to detect.
Most of what I read suggested that 1.5w was still more than most modern lights would need so there'd be no difference in brightness but that a 1.5w hub wouldn't be able to run a charger like a Plug etc.
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You'll need to pair it with a 1.5W optimised headlight as you'll never get anywhere near to max light output on the Cyo (1.3W after you take out the 0.2W for the rear). Would be a waste of a decent headlight IMO...
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A device that accepts 3W of charge power will take twice as long to charge. If the 1.5W is less than its power consumption it will indicate it is charging but will discharge (more slowly). 3W is on the threshold for many devices (smartphones especially). Personally I wouldn't buy a 1.5W dynamo.
The 3W XT version isn't much more, it's what I use (over here in the UK it's called the 3N80). There's also the cheaper 3n72 (LX) version if you can stomach the 100g weight penalty. The internal electrics are identical. These are the only Shimano hubs worth considering in terms of resistance -v- efficiency.
As I recall the 3n72 was painted black and became an Alpine. Can't remember the model number however.
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M_V
Alb
acharnley
@cornelius_blackfoot
am about to pull the trigger on this shimano xt disc dynamo hub.
https://www.rosebikes.co.uk/article/shimano-deore-xt-dh-t785-1d-disc-hub-dynamo/aid:742795
should I be worried in any way that it's 6v and 1.5w??
Most hubs seem to be 6v and 3.0w, wanting to pair it with a B + M IQ Cyo and a B + M Toplight rear brake light, will there be any issues, will the lights be underpowered???
thanks in advance