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cornelius_blackfoot
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.