Got it. I assumed that you only needed the electrical stuff for short tours with the family, did not realize this was also to be used for something like gravel racing. Yeah, I can see why you would want a dynohub.

Sounds like you mean the B&M Luxos U, be careful when you order that you get the "U" version, the "B" version of the Luxos does not have the USB port.

I have a Luxos U on one of my touring bikes, nice light, very nice beam pattern, the USB charging plays well with my Garmin GPS for charging. Has a small internal pass through cache battery pack so that it will keep charging your GPS when you stop at a stop light, etc.

You will find that the Luxos U will only produce as much power at the USB port as your hub produces, but the small internal pass through cache battery pack has only about 1 watt hour of capacity and it can deliver power to your device faster than the hub can produce it. So, you will find that the charging can be off and on as the internal electronics charge up and discharge that internal battery pack. That is not a problem, but when you first get it, it can be a surprise and you might think that something is broken if you find that it stopped charging your device for a while.

The Luxos U puts out 70 lux, but for short periods can put out 90 lux by using power from the internal cache battery pack, I almost never use the 90 lux so I can't say how long you can get the higher power lighting.

Not sure how well the light pattern will work for gravel racing, the light pattern is much like a car low beam headlight, wide with a sharp cut off that avoids shining bright light in the eyes of oncoming traffic. But if your gravel racing will have much ups and downs, since I have never done any gravel racing I have no idea how well that light pattern will work for it. This light pattern photo is at the 90, not 70 lux rate.
https://www.bumm.de/files/Produkte/9...0Flutlicht.jpg

But the Luxos U has a large plastic housing, I find that there is nothing wrong with that housing, but some have cracked them or broken the housing at the mount. I am careful to avoid doing something stupid with the light that might break it and I generally am careful with all my stuff, so that has not been a problem. Just giving you a heads up.

Keep in mind what I said previously when touring with family, if you are producing less than 2 watts when you are rolling, you are not going to be charging up a lot of other devices unless you start your trip with a large power bank that has several extra days of capacity. On a longer trip you might also need to charge up a power bank.

I wrote up a long forum post on a different forum on what works for me for electrics when bike touring after my last tour, it was a solo tour for five weeks, almost exclusively camping. You previously saw my comment that for touring, I only use the hub for charging, not lighting, I elaborate in that post on what I brought with me and why I chose each item that I used, that post is at:
Electrics that I use for bike touring - what works for me.


I agree with your thoughts on solar. You are not going to charge up a power bank that has a built in solar panel in a reasonable amount of time. I bought a couple powerbanks that have built in solar panels, I bought them because they are good power banks and were on a clearance price. Happy with them, but I did not buy them for the panels, it would take 30 hours of direct sunlight on a clear day with the power banks aimed just right to charge them up.