Lighting equipment can be seen everywhere in our life. Some lights have the same color and brightness in our eyes, but we may feel tired or uncomfortable under a certain light for a long time, and we may feel something wrong when looking at things. In fact, there are several parameters of lighting equipment that will directly affect the use effect. Let's introduce these common parameters.

Color rendering index
The color rendering index refers to the ability to restore the color of the object itself when the light source shines on the object. The color rendering index of sunlight is defined as 100. The higher the color rendering index, the better the color of the object itself can be restored when the object is illuminated by the light source. A low color rendering index will lead to color distortion of the irradiated object, which will lead to failure to achieve the expected effect in application scenarios such as display, design, and calibration.

Color temperature
The Kelvin temperature when the light emitted by the light source is consistent with the color of the black body radiator due to heating, the unit is K, and the color temperature gradually changes from warm to cold from low to high.

Color temperature is only meaningful when the light source emits light similar to a black body radiator, and has no meaning for a single color (eg green, purple). The indoor lighting in our daily life generally has a color temperature of about 4000K-6000K, and the color temperature of matches is about 1700K.
Color temperature will have corresponding requirements for different needs in different scenes, for example, in bedrooms and hotels, low color temperature can make people feel warm, comfortable and relaxed; in hospitals, offices and other environments, high color temperature can make people concentrate , so the color temperature in these scenes will be relatively high; the color temperature in industrial environments will have more requirements for different situations.

Luminous flux
Luminous flux refers to the total amount of light emitted by a point light source, and the unit is lumens. The luminous flux cannot fully represent the brightness of the light source. At this time, another parameter is involved, that is, illuminance.

Illumination
Illuminance refers to the luminous flux per unit area, and the unit is lux. In the case of the same luminous flux, different areas will actually affect the perception of brightness. The more luminous flux injected per unit area, the brighter it will be.