what does lux mean
The lux (symbol: lx) is the SI unit of illuminance and luminous emittance, measuring luminous flux per unit area. It is equal to one lumen per square metre. In photometry, this is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface.or monochromatic light of this wavelength, the amount of illuminance for a given amount of irradiance is maximum: 683.002 lux per W/m 2; the irradiance needed to make one lux at this wavelength is about 1.464 mW /m 2. Other wavelengths of visible light produce fewer lux per watt-per-meter-squared.