Doesn’t have to be all in one, however for a helmet light I’m not sure which is best?
TBH depends on how you feel about cables, I’d rather have a small lightweight head unit on my head, and a cable- especially if you want higher power or burn time. I don’t like the feeling of weight on top and being able to get more light for less money makes it a no brainer for me but then, other people don’t like wires, ymmv. To me there’s always at least one massive downside to a selfcontained light
Exposure’s helmet light mount is absolute genius though.
I’m just trialling a BT40S, which is an inexpensive, midpower floodlight, and quite liking it. The logic always used to go that your helmet light should be a spotlight but imo we’re past that now, a wider more even beam is better to ride in and the power levels make it possible to have range and spread. (a modern spotlight can have huge range but in practice, who cares? I basically want to see to the next corner)