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The lamps knowledge: lighting-related terms


  Luminous flux: visible light emitted by light source per second, the amount of, and simple is the amount of light emitted. Unit: lumen (lm)

  Illuminance: the luminous flux incident per unit area, is the luminous flux divided by the area's value.Unit: lux (lux). Illumination level of illumination and vertical illumination. Level of illumination of the surface level of luminous flux incident illuminance, vertical illuminance is the luminous flux incident to the vertical illuminance.

  Light intensity: Symbol and unit candela the cd on the luminous flux emitted by the luminous body in the specific direction of the unit solid angle

  Brightness: Symbol L unit Benny off cd/m2 description of the luminous flux of the luminous body in the specific direction of the unit solid angle per unit area

  Luminous efficiency: the units of lumens per watt Lm / w, indicating electric light source that converts electrical energy to light the ability of the luminous flux emitted divided by power consumption to represent

  Average life expectancy: in hours, indicating the number of hours refers to the number of bulbs to 50 per cent of the number of damaged

  Economic life: the units of hours, taking into account the damage to the light bulb and output attenuation of the beam conditions, the beam output is reduced to a specified number of hours. Light of this ratio to the outdoors for 70 per cent, compared with 80 percent for indoor lighting such as fluorescent.

  Color temperature: absolute temperature K, is about to a standard blackbody heating, the temperature rises to a certain extent color from dark red - light red - orange - white - blue, gradually changing the color of a light source with the blackbody at the same time, we known as the light source color temperature of the blackbody at the time of the absolute temperature.

  Color temperature, light and colors are also different:

  Color temperature below 3300K light color cast red to give a warm feeling; stable atmosphere, warm feeling;

  Color temperature 3000 - 6000K for the middle tone, particularly evident in the visual and psychological effect, refreshing feeling; so called "neutral" color temperature.

  Color temperature of 6000K, the light color blue gives a feeling of cold,

  under the irradiation of a color temperature and brightness of high color temperature light source, such as brightness to the people there is an atmosphere of yin; under the irradiation of low color temperature light source, the brightness is too high will give people a sultry feel.

  (b) the contrast of light and color in the same space using the two kinds of light color light, the contrast there will be a level effect, light and color contrast, brightness level at the same time, the level of the light color is available.

  Low color temperature light source radiation to make red more vivid;

  Color temperature light source radiation, the blue with a cool feeling;

  High color temperature light source irradiation, so that objects feel cold.

  Color: light on the degree of color rendering of the object itself as color, that is, the extent of color fidelity; light color is the color rendering index, it means that the objects in the color of light than the reference light (sun light) lighting, color deviation, the more fully reflect the color characteristics of the light source. High color rendering light source performance of the color is better, the colors we have seen it close to the natural color, low color rendering of light color performance is poor, we have seen the color deviation. International Commission on Illumination CIE color rendering index of the sun as the 100, all kinds of color rendering index, such as: high pressure sodium lamp color rendering index Ra = 23, fluorescent tubes, color rendering index Ra = 60 ~ 90.

  Optical efficiency: an important indicator to measure the light energy, light emitted luminous flux divided by the light source power consumption. Unit: lm / watt (lm / w).

  Color are two

  Faithfully significant color: correct performance material original color need to use a color rendering index (Ra) high light, its value is close to 100, the color best.

  The effect of color: a distinct emphasis on a particular color performance of life in the United States can take advantage of the additive method to enhance the effect of color.

  Glare: vision, objects of high brightness or the strong brightness and contrast, you can cause visual discomfort known as glare. Glare, disability glare and discomfort glare, glare is an important factor affecting the quality of lighting.

  Electromagnetic interference: gas discharge lamps during use, such as radiation, conduction by the surrounding electrical interference.

  Electromagnetic noise: may cause the surrounding abnormal electrical work, even out of control.

  Average life: light time in the 50% damage.

  A high degree of contrast: identify the object and the background brightness difference between the brightness of the background is called the luminance contrast, contrast affect the visibility of the object. Contrast to the large objects are likely to be observed, and in the close sense of visual excitement.

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