Luminous flux : LM, the sum of the energy emitted by the light source and received by human eyes is the luminous flux.
Light intensity : CD, the intensity of light, the intensity of visible light emitted in a certain direction.
Illumination : Lux, Illuminance is the ratio of the luminous flux to the illuminated area. 1Lux refers to the brightness of 1Lm's luminous flux evenly distributed on a plane with an area of 1m2.
Color temperature: K. When the color of the light emitted by the light source is the same as the color of the "black body" radiated at a certain temperature, the temperature of the "black body" is referred to as the color temperature of the light source. The higher the temperature of the "black body," the more blue the component is in the spectrum, and the less the red component. For example, the light color of an incandescent lamp is warm, its color temperature is 2700K, and the color temperature of a daylight fluorescent lamp is 6000K. The color temperature is represented by the absolute temperature K. The higher the color temperature value, the stronger the cold feeling. The lower the color temperature is, the stronger the warm feeling is, and the softer it is. Usually, most of the light source designs are concentrated in two color temperature positions of 2700K~4300K and 5800K~6700K.
Color rendering: In principle, artificial light should be the same as natural light, so that the naked eye can correctly distinguish the color of things. Of course, this depends on the location and purpose of the lighting. The extent to which a light source presents its color is called color rendering. Often referred to as the "Color Rendering Index" (Ra)
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