...in lux, which is a measure of how much light actually falls on a specific target at a specific distance. It's a much better comparison than lumens, which is a raw measure of light output, not necessarily what ends up on the road.
Hard to say which is a better rating, unless the lux ratings take several targets into account. Otherwise you end up with a low-output, highly-focused beam being the same 'rating' as a high-output, wide one.