Electrical lighting is a type of artificial lighting that has the advantages of stable lighting, easy control, adjustment, safety, and economy. It is the most widely used lighting method in modern artificial lighting. The basic concepts related to electrical lighting are as follows (1) Luminous flux. The energy emitted by a light source into the surrounding space per unit time that can cause the human eye to produce a sense of light is called luminous flux, commonly referred to as luminous flux, and its unit is lumens (lm) (2) Light intensity. The radiation intensity of a light source in a given direction is called luminous intensity, commonly referred to as light intensity, and its unit is candela (cd) (3) Illuminance. The luminous flux projected per unit area on the surface of the illuminated object is called illuminance, and its unit is lux (Ix) (4) Brightness. The luminous intensity of a luminous body on the unit projection plane in the direction of the line of sight is called brightness, and its unit is (cd/m ²)。 The luminous body referred to here is not only a light source, but all illuminated objects will reflect light, so it can be considered as an indirect luminous body for the human eye. The brightness value of the luminescent body is actually independent of the line of sight (5) Color rendering of the light source. The property of a light source in displaying the color of the illuminated object is called the color rendering of the light source
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