# Illuminance and luminance relationship

### Luminance - Wikipedia

In photometry, illuminance is the total luminous flux incident on a surface, per unit area. It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with. Is there any way to convert illuminance (e.g. 30 lux) to luminance . in relation to the illuminance incident on that surface, can be defined as. The illuminance or light level is the amount of light energy reaching a given point on a defined surface area, which is the luminous flux (i.e. lumens) per square meter. (NOTE — The unit of illuminance (the measurement of illumination) is Iux which is 1 lumen per square metre.).

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