Unterhausen raises a good point, some lights including the Luxos U have had a reputation for water ingress or other failures. I think that most of the water problems with the Luxos U were solved after they re-designed the remote switch several years ago, but you still occasionally hear of failures. Apparently the four electrical contacts in the rear are not waterproofed in any way. I do not tour with my Luxos U, I mostly use it for around home riding and I usually do not ride on rainy days by choice.

There are merits to a good charger and a separate headlamp. Then if one fails, you still have the other and you can replace the part that failed later.

I noted above that I have a IQ-XS on my rando bike which puts out a good light beam for riding on pavement, is a good price, and is pretty robust for construction, I like the beam on the Luxos U better, but only slightly better that the XS.

And I use a Sinewave Revolution charger which is VERY water proof for touring. Have been using the same one since I bought it in 2016 for a trip to Iceland where it is known for frequent precipitation, I specifically wanted the best waterproofed charger I could find for that trip.

That light and a Sinewave Revolution (or similar) charger as a pair are comparably priced to a Luxos U for USA based buyers. The disadvantage to this pair is that some devices that are picky about their power supply (my Garmin 64 is VERY picky) need a pass through cache battery and the Sinewave lacks that while the Luxos U includes it.