The concept of candlelight was first invented by the British, and it is a unit of luminous intensity.Īt that time, the British used a pound of white wax to make a one-foot-long candle to define the unit of candlelight. Lumen is a unit of luminous flux.Ī point light source with a luminous intensity of 1 candela has a luminous flux of “1 lumen” per unit solid angle (1 steradian).Ĭandlelight (Candela), transliteration “Candela”. When an object is uniformly illuminated by light, when the luminous flux obtained on an area of 1 square meter is 1 lumen, its illuminance is 1 lux.
Suppose the luminous flux on the surface element dS is dΦ, then the illuminance E on this surface element is: E=dΦ/dS.ġ lx=1 lm/㎡. The illumination/illuminance on a surface illuminated by light is defined as the luminous flux illuminating a unit area.
It can be measured with an illuminance meter. The light intensity has a great influence on the photosynthesis of organisms. The international unit of luminosity is the candlelight received per square meter. In photometry, “luminance” is the density of luminous intensity in a specified direction, but it is often misunderstood as illuminance. It is used to indicate the intensity of light and the amount of illumination of the surface area of the object. Abbreviated as illuminance, unit Lux (Lux or lx). Illumination intensity is a physical term that refers to the luminous flux of visible light received per unit area. How to express light distribution curve.Definition of light distribution curve:.
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