Originally Posted by
noglider
I don't think there is a single light that has both a lux rating and a lumens rating. It's very unfortunate.
Supernova gives both values for their high-end lights,
see e.g. here. However unless you see the beam pattern against a wall, that lux value does not help much, as it is only measured at a single point.
For the B&M Ixon Space (and the IQ-XE) the lux value is given by the manufacturer (150 lx), the lumen value was measured for a test in a (german) bike magazin in a sphere (500 lm).