Okay, charging a laptop might be beyond my ability, and I might need 2 or even 3 (I have a trike) hub generators to take care of everything else. I don't plan on biking after dark, so could use a headlight that I only flash on for a moment to make myself visible to oncoming traffic, if necessary, otherwise won't have a headlight drawing current. Little things like the computer should be relatively insignificant, and I don't have to be charging everything at once. I still need to find out what's required for transformers or whatever. Anyone have any experience with using a hub generator to power lights (or anything else) that are normally battery powered? And, sure, I can always find an outlet to bum some juice, but it's more of a philosophical green tree-hugging thing.