An lux meter, also known as a lux meter, is a specialized instrument for measuring luminosity and brightness. It is the measurement of light intensity (illuminance), which is the degree to which an object is illuminated, that is, the ratio of the luminous flux obtained on the surface of the object to the illuminated area. An illuminance meter is usually composed of a selenium or silicon photovoltaic cell and a microampere meter. Illuminance meters have been successfully applied to multiple solutions, such as the lighting industry, photography industry, stage lighting layout, etc. Different models of illuminance meters can meet different measurement requirements.Has three major characteristics: