600 lumens is less than a single auto headlight puts out but they have more controlled beam shape than the LED flashlights typically do. Also per my understanding many of the Chinese LED flashlights are grossly overrated for light output. In a lot of cases you are lucky to get more than half the claimed Lumens. Even so aim it carefully when installing it.

IMO any high intensity light for regular bicycle use should have rechargeable batteries or they get expensive to feed.