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  日期:2011-11-18  浏览次数:70

     LED (Lighting Emitting Diode) light-emitting diode is a semiconductor light-emitting solid device. It is the use of solid semiconductor chip as luminescent materials in the semiconductor compound occurs through the carrier release excess energy caused by photon emission, the direct issue of red, yellow, blue, green, blue, orange, purple, white light. LED lighting products is the use of LED as a light source created by the lighting apparatus.
      1, the luminous flux (lm): the amount of light per second issued by the sum of visible light. For example, a 100-watt (w) for bulb produces 1500 lumens (lm), a 40-watt (w), can produce 3500lm lamp luminous flux.
      2, the luminous intensity (cd): light source within the unit solid angle emitted flux, which is the light flux emitted by the selected direction in the space density distribution. Intensity unit is Cantera (cd), also known as candlelight. Such as: a unit solid angle to issue a lumen (lm) of light called a Cantera (cd).
      3, the illuminance (lx) is according to the body suffered luminous flux per unit area, unit lux (lx) = lumen / m
      4, the color temperature (K) color temperature is apparent when the light source with an absolute black body color temperature combustion appear to be the color is consistent to define when the combustion temperature, and its unit is the absolute temperature Kelvin (K) . The higher the K value, the more the colors tend to appear white blue; K value is lower, the more the colors tend to appear red and yellow
      5, the luminous efficiency (lm / w): the luminous flux emitted light divided by the power consumed. It is an important indicator to measure light energy.
      6.. Color rendering index (Ra)
      Color index used to measure the natural light irradiation, can see color and light irradiation in a color that can be seen between the ratio of the Ra = in a light irradiation can see the color ÷ in natural light irradiation can see color.
      Ra said that a certain color rendering index. Ra The more close to 100%, indicating that the light irradiation, shown by the natural light in color and appear under the more small differences in color.
      7, glare: a high field intensity within the object or strong brightness contrast, and the resulting visual comfort as glare, glare is an important factor affecting the quality of lighting
      8, wavelength: two LED wavelengths of light emitted, usually red wavelength 620-660nm, Pure Green 520-530nm, the blue 470-480nm, Yellow 580-890nm, yellow 550-570nm, emits light of different wavelengths different colors; mixing two colors of light are also different.
      9, strobe: electric light flux fluctuations in the depth, the depth of the greater volatility, the greater the depth of strobe. Electric light the stroboscopic effect will cause visual fatigue, migraine headaches, damage to the eyes of young people growing form of myopia.
      10 life: brightness light-emitting diode means half the initial value of the time, has become a half-life, different chips used in different environments have different life.


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