More complicated than that - beam pattern determines where the lumens (technically, photons) the LED is emitting wind up, and if they are doing you any good. Hence a "300L" light may be more useful than an "800L" model. At least across different vendors. Within a single source (at least those that want to be in business for a while), bigger may actually be better. Also possible to be too big (turn night into high noon on technical singletrack probably >> for use on suburban bike paths). Re: "based in China" and "reliable claims" do not belong in the same sentence unless modified with "not", "un", or equivalent negation.