Luminous efficacy, is the ratio of the luminous flux emitted by a light source to the power consumed, in Lumen/Watt. In layman's terms, light efficiency refers to the ability of the luminaire to convert electrical energy into light.
Different light sources emit the same amount of luminous flux, the less power consumed, the higher the luminous efficiency. The higher the luminous efficiency value, the stronger the ability of the lighting equipment to convert electrical energy into light energy, that is, in the case of providing the same brightness, the stronger the energy efficiency of the lighting equipment; under the same power, the stronger the lighting equipment, that is, the greater the brightness.
Luminous original meaning is light, measurement with luminance, meaning brightness, abbreviated as lm. luminous efficiency unit for the brightness / watt, sometimes take Luminance pronunciation of "lumen", do lumen / watt.
Luminous efficiency characterizes the ratio of the luminous flux emitted from the light source to the electrical power consumed by the light source. That is, η=φ/E=φ/(φ+P). Where η is the luminous efficiency, φ is the light energy radiated by the light source, E is the power of the light source, P is the energy lost by the light source, mainly heat generation.
The following outlines the luminous efficiency of certain electric light sources.
Ordinary bulb: 8-18lm/w
Halogen lamp: 12-24lm/w
Daylight type fluorescent lamp: 40-50lm/w
Fluorescent high-pressure mercury lamp: 35-55lm/w
Luminous efficiency is an important symbol of the development of electric light sources. 100 years, lighting electric light sources have made rapid development, the luminous efficiency of light sources have been greatly improved, for the development of modern lighting technology, the development of a solid foundation.
With the continuous development of technology, LED not only can achieve high luminous efficiency, but also has the advantages of energy saving, environmental protection, fast response time, etc. ADAYO lighting this downlight 18W with adjustable brackets fit different openings luminous efficacy can be achieved 100lm/w.
