Use this useful tool to convert weight choosing one of the 8 units of measurment included in this app, that are:
Lux:
lux and kilolux
Lumen derived:
lumen per square meter, lumen per square centimeter, lumen per square foot and lumen per square inch
Other illuminance units:
phot and nox
For every units of measurment are also included formulas to convert that unit as you want.