Candela to lux calculation with distance in meters

The illuminance E_v in lux (lx) is equal to the luminous intensity I_v in candela (cd),

divided by the square distance from the light source d² in square meters (m²):

E_v(lx) = I_v(cd) / (d_(m))²

_So

lux = candela / square meters

_Or

lx = cd / m²

lx 与cd 的计算方法