LED light source which technical indicators?

Publishdate:2014-10-17 View:762

   Technical indicators LED lighting source as follows: 


   Emission wavelength: hair color changes in the strength, it can be described by the data, this data is compared with the wavelength. The wavelength of light that we can see, in the range of 380 to 780mm. Unit: nm. 


   Brightness: The brightness is the degree of light and dark objects, is defined as the luminous intensity per unit area. Unit: Bennett (nit) 


   Luminous intensity (brightness): luminous intensity (brightness, I) defined as: a point light source luminous intensity in a certain direction, that is, the amount of light in the luminous body per unit time emitted, also referred to as brightness, commonly candelas (cd , candela), the definition of an international candlelight with whale oil for candles made ​​of 120 cells per hour, burning luminosity cold (grain) issued a cold frame is equal to 0.0648 g. Common units of candlelight luminous intensity (cd, cd), the international standard candles (lcd) is defined as an ideal blackbody at the freezing point of platinum temperature (1769 ° C), the perpendicular to the blackbody (a surface area of ​​1m2) 60 live births direction luminosity, one of the so-called ideal blackbody radiation refers to an object is equal to 1, the energy absorbed by the object can be completely out of radiation, the temperature has remained fixed uniform international standard candles (candela) and the old standard candle (candle) interchangeable relationship 1candela = 0.981candle. 


   Flux: Luminous definition is: point source and non-point sources of energy in the emitted per unit of time, which can produce a visual person (who can feel out of radiant flux) is known as flux. Luminous flux in lumens (abbreviated lm), 1 lm (lumen or lm) is defined as an area of ​​international standard candles 4r2, so lumen luminous flux equal to a quarter of the luminous flux emitted by candlelight, or that sphere has four, so in accordance with the definition lumens seen a cd of point light will radiate four lumens, ie lumens = 4I (candlelight). 


   CRI: dosage accurately describe the color of the light source of a parameter, with the Ra said. Luminous body (sunlight) color rendering Ra = 100 (that is, any object in sunlight exposure, the object has the most realistic color or texture). 


   Illumination: Illumination (E) is defined as: the illuminated object units by the illuminated area accepted flux, or objects by light irradiation in a unit time per unit area accepted photometric units in lux or footcandles (fcc) Fig. Illumination and brightness, the relationship between the distance is: E (illumination) = I (luminosity) / r2 (distance squared). Distance illumination and illuminated body photometric luminous intensity, and notes between the body and the light source has a tube, but has nothing to do with the color according to body surface properties and surface area size. 


   One meter candle: one meter is the distance a candlelight candlelight source (point source and non-point source) and one meter illumination with light orthogonal plane, called lux (LUX, also has written lx), per square m received within a lumen of luminous flux when the illuminance (lumens / m 2). 


   Luminous efficiency (lumens / watt, lm / w): total flux of light emitted by the light source and the electric power consumed (W) ratio, referred to as the luminous efficiency of the light source. 


   Color: the color of a particular light source when the light (thermal radiation source) and emitted at a temperature radiator is safe (in bold) of the color of the light generated, the same safety, radiation safety body temperature (in bold), referred to the color temperature (k). Color temperature is a parameter used to describe a luminous body emits light colors. When the light source emits light with a color temperature of the black body radiation at a color close to black body temperature is called correlated color temperature of the light source unit of k. 


   Protection class: IP protection class is the lighting according to their dust, anti-moisture characteristics to grade, composed by two numbers, the first number represents the light dust, prevent foreign matter intrusion rating (points 0-6 grade) the second number represents the lamps against moisture, the degree of intrusion waterproof seal (points 0-8 grade), the larger the number, the higher degree of protection.