Illuminance (Photometry)
In photometry, illuminance is the total luminous flux incident on a surface, per unit area. It is a measure of the intensity of the incident light, wavelength-weighted by the luminosity function to correlate with human brightness perception. Similarly, luminous emittance is the luminous flux per unit area emitted from a surface. Luminous emittance is also known as luminous exitance.
- Microlux (µlx)1,000,000
- Millilux (mlx)1,000
- Lux (lx)1
- Kilolux (klx)1×10⁻³
- Lumen per square metre (lm/m²)1
- Lumen per square centimetre (lm/cm²)1×10⁻⁴
- Foot-candle (fc)0.09
- Phot (ph)1×10⁻⁴
- Nox1,000