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Colour Temperature ：
Definition: Color temperature (Color Temperature) is the whole black body with different temperatures to produce different colors. The color temperature of a light source is determined by comparing its color to a theoretical thermal blackbody radiator. The unit is Kelvin (Kelvin is the unit of measurement for temperature, symbol K).
Explanation: Color temperature, also known as white balance, refers to the color of the light (cold and warm tendency) when the color rendering of the light source is extremely high, which was an essential parameter a long time ago. The color rendering of the light source is the basis for the existence of color temperature. Without color rendering, it is impossible to talk about color temperature.
the definition of luminous efficiency: luminous efficiency, that is, luminous efficiency, is the ratio of luminous flux to consumed electrical power (lm/w), that is to say, the luminous flux released per 1W of electrical energy consumed. It is a measure of the economic performance of a light source.
Explanation: Light efficiency refers to the ability of a lamp to convert electrical energy into light. For example, a 13W 4000K energy-saving lamp has a light efficiency of 58lm/W. Then this 13W energy-saving lamp can emit 754lm (lumens) of light per second.
The luminous efficiency of energy-saving lamps with different power and light colors is different. For example, 5W 2700K energy-saving lighting effect is 50lm/W, and 13W 6000K is 54 lm/W. Light sources with the same power and colors have different light effects, so you must pay attention.
For different light sources, the same power, the higher the luminous efficiency, the greater the luminous flux, and the more energy-saving.
It is worth mentioning that the luminous efficiency of LED light sources has continuously improved in recent years, from less than 1 Lm/W at the beginning to 208 Lm/W now. With the breakthrough of technology, it is still improving.
Color rendering index
Definition of Color Rendering Index :
Color Rendering Index ( CRI), referred to as CRI, is used to measure the ability of a light source to reproduce a set of 8 standard color match colors. In layman's terms, the light shining on the same dish has different properties, be called the color rendering index. Sunlight is considered ideal or CRI 100.
Explanation: The indicator of the degree of reproducibility of the light source to the object's natural color. The higher the value, the better the color reproducibility of the light source. Under normal circumstances, we take sunlight as the standard reference light source and stipulate that its color rendering index is 100.
Index (Ra) Rating Color Rendering General Application
90—100 1A Excellent for places that require accurate color contrast
80—89 1B / Places where correct color judgment is required
60—79 2 Generally, places that require medium color rendering
40—59 3 / Places with low requirements for color rendering and slight color difference
20—39 4 Poor places with no specific requirements for color rendering
When paying attention to the light source's color rendering, we first look at Ra. Then, most LED light sources are usually discontinuous and narrow in the frequency band, depending on the spectral distribution.
On the whole, in places with rich colors and high requirements, such as museums, supermarkets, shops, and restaurants, we should choose light sources with a relatively continuous spectrum and a wider frequency band to truly restore the true, beautiful, and comfortable colors of items, which is helpful for the display and sale of items and creating an ambient atmosphere.
The following picture is the effect of flowers under different Ra: