For lambertian surfaces (Section 4.3, “Lambertian Emission and Reflection”), you can convert between luminance and illuminance with the following equation: Wrong, you cannot. Those are different quantities in different units.
Note that though the Exposure Value vs Luminance and Illuminance Table suggests that it is possible to convert cd/m² directly to lux, this is not the case because lux is used to measure the amount of light that falls onto a surface while cd/m² is a unit to measure the perceived brightness of a surface.
With a single click, you can convert brightness. You simply need to enter the value and choose the unit you wish to convert before clicking the Convert button. Within a second, your unit will be transformed to onter units. Our goal is to provide online free tools so you don't have to install any software for basic usages.