Light intensity refers to the energy that receives visible light per unit area, referred to as illumination [1], unit Lux (Lux or Lx). In physical terms, it is used to indicate the intensity of illumination and the extent to which the surface area of an object is illuminated.
In photometry, "photometry" is the density of the luminous intensity in a specified direction, but it is often misunderstood as illumination. The international unit of luminosity is the candlelight received per square metre (mainland China, Hong Kong and Macao are called Candela).
Illumination/illuminance on a surface irradiated by light is defined as the luminous flux per unit area.
Let the luminous flux on the surface dS be d_, then the illumination E on the surface dS is E=d_/dS.
1 LX = 1 lm/. The illumination of an object uniformly illuminated by light is 1 lux when its luminous flux is 1 lumen per square metre. Lumen is the unit of light flux.
Illumination Intensity and Photosynthesis Intensity Curve
Illumination Intensity and Photosynthesis Intensity Curve
The luminous intensity is a point light source of candlelight, and the luminous flux is "1 lumen" within the unit solid angle (1 sphericity).
Candela, transliterated as Candela. The concept of candlelight was first invented by the British. It is a unit of Luminous intensity.
At that time, the British defined the unit of candle light as the light emitted by a foot-long candle made from a pound of white wax. Now the definition has changed: a cubic centimeter of black light emitting body heated until it melts into liquid, the amount of light emitted by the standard light source is 1/60, and candlelight is the unit of light emitted by the standard light source.
