Color temperature: represented by the absolute temperature K, it is to heat a standard black body. When the temperature rises to a certain degree, the color starts to change from red - light red - orange - yellow - white - blue - white - blue, and gradually changes. Using the characteristics of light color change, the light color of a light source is the same as the light color of a black body at a certain temperature, we call the absolute temperature of the black body at that time as the related color temperature of the light source.
Color rendering index (Ra) : A parameter that measures the ability of the light source to display the true color of the illuminated object. The higher the color rendering index (0-100), the closer the color reproduction is to the natural primary color. More than 90 is very good, the color identification of high requirements, such as printing, printing and dyeing products inspection. 80-90 is very good, color TV relays, display exhibits lighting. 65-80 is better for interior lighting. 50-65 is medium, outdoor lighting. Less than 50 is poor, the color requirements are not high, such as parking lot, freight yard, etc.
Luminous flux (lumen Lm) : represents how much the luminous body emits light. Lumen is a unit of luminous flux. The more luminous the greater the number of lumens.
Luminous efficiency: The ratio of the luminous flux produced by a light source to the electric power consumed. The units are lumens per watt (Lm/W).
Average life: Also known as rated life, it refers to the number of hours a batch of lights on until half the number of damaged.
Light intensity: Light flux within a unit solid Angle. Unit: cd
Illuminance: Illuminance is used to describe the degree of illumination on the exposed surface (working face) and is usually expressed in lux (lx) or lumens per square meter (lm/m2) in terms of the flux of light received within its unit area.
Luminance: Luminance is a physical quantity used to represent the intensity of luminance (or reflection) on the surface of an object. The ratio of luminance intensity of the luminous surface of the object being viewed in the line of sight direction to the projected area of the luminous surface perpendicular to the direction is called luminance surface, and the unit is Candra per square meter (cd/m2).
Luminous efficiency: Usually referred to as light efficiency for short, is to describe the quality and economic optical quantity of the light source, it reflects the amount of light flux radiated by the light source in unit energy consumption at the same time, the unit is lumen per watt (lm/w) beam Angle: refers to the light Angle of the lamp cup Angle. Generally, there are three kinds of 10°, 24° and 38°.
Color development: The color development index of the light source and illuminance together determine the visual clarity of the environment. There is a balance between illuminance and color rendering index. The results of extensive experiments show that the illumination value of an office illuminated with a color rendering index Ra>90 is more than 25% higher in terms of its appearance satisfaction than that of an office illuminated with a low color rendering index lamp Ra<60.
Light environment: Light environment is people's psychological feeling of light in a certain visual space. A good light environment gives people a good visual feeling, which directly affects people's physical and mental health. People in the consideration of creating a good light environment at the same time, to consider the problem of energy saving. The concept of green lighting is how to reduce the amount of mercury released, how to save the limited energy that humans can survive.
