LED Commercial Lightings Basics —— Definition of Lighting

1. lumen:

  Lumen is the basic unit of luminous flux, representing the total amount of visible light emitted by a light source per unit of time. The higher the lumen value, the higher the brightness of the lamp.   People often “lumens” and “wattage” in the concept of confusion, but lumens are used to measure the brightness of lamps and lanterns. In contrast, wattage is used to describe the size of the lamps and lanterns of the power, lumens and watts in the lamps and lanterns, respectively, represent a different physical quantity and characteristics, in the selection of lamps, and lanterns Lumen and wattage represent different physical quantities and characteristics in the lamps, when choosing lamps, you need to consider both lumen and wattage according to the actual needs and uses.   2. Color temperature (CCT):   Color temperature is a physical quantity used to define the color of the light source in lighting optics, and is also the most common indicator of the spectral quality of the light source. Color temperature is generally expressed in CCT, the unit is K (Kevin).     Color temperature value is through a standard black body (such as iron) heating, the temperature rises to a certain degree when the color begins by: red -> light red -> orange -> white -> blue white -> blue, gradually changing, using this light color change characteristics, the light color of a light source and the black body at a certain temperature presents the same time the color of the light, we will be black body at that time the absolute warmth of the color temperature known as the light source. Due to the difference in color temperature, it can be divided into warm light, warm white light, and cool light. -Warm light    The color temperature of warm light is below 3300K. Warm light is similar to incandescent light, with more red light components, which can give people a warm, healthy, and comfortable feeling. It is suitable for an entrance hall, bedroom, and other places.     -Warm white light   Warm white light, also called neutral light, has a color temperature between 3300 K and 5300 K. Due to its soft light, neutral color gives people a pleasant and peaceful feeling. It is suitable for the living room, dining room, kitchen, and other places.   -Cool white light   Cold white light is also called daylight color, its color temperature is above 5300K, the light source is close to natural light, it has a bright feeling and makes people concentrate. It is also suitable for a study room, kitchen, and other places.   3. Color rendering (CRI):   The extent of the light source on the object color presentation is called color rendering, refers to the light source on the object's true color reproduction, expressed in English CRI, unit is Ra. International Commission on Illumination stipulates that the natural light as a reference light source, the color rendering index value Ra is set at 100, the closer the value of the color rendering index of 100, the color reproduction of the object the more powerful the ability of the human eye to distinguish between the color of the object the more easily. Lighting is not only for lighting but also to create a home atmosphere for the tool, high index of light will make the space more bright and vivid, infectious, while the color rendering index is too low, it will affect the human eye for the color of the object judgment, long-term in the environment of low index will cause a variety of vision problems, so in the home life, you can try to choose a high index of lamps and lanterns (RA ≥ 80).  

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