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Lighting terminology

Lighting terminology 2010-5-2

Luminous flux: the visible light emitted per second source volume and simple terms it is light volume. Unit: lumen (lm)
Illumination: the luminous flux incident per unit area, which is divided by the area of the resulting flux values. Unit: lux (lux).Divided into horizontal and vertical illuminance illuminance illuminance. Level of illumination level for the luminous flux incident surface illumination, vertical illumination luminous flux incident to the vertical illumination.
Light intensity: Symbol I, unit candela cd, luminous body in a specific direction shows the unit solid angle emitted luminous flux
Brightness: Symbol L, unit off Nigeria cd/m2, shows luminous body in a specific direction within the unit solid angle per unit area of the luminous flux
Luminous efficiency: lumens per watt unit Lm / w, shows electric light into electrical energy to light the ability to send power to represent the flux divided by the
Average life expectancy: unit hour, indicating that a number of light bulbs to 50% of the amount of damage the number of hours
Economic life: Unit hours, indicating at the same time considering the damage and the beam bulb output attenuation conditions, the integrated beam output reduced to a specific number of hours. This ratio is used for the 70% outdoor lighting for indoor lighting such as fluorescent lamps, compared with 80 percent.
Color Temperature: K to absolute temperature, said about a standard blackbody heated to a certain degree, the temperature started by the dark red color - light red - orange - white - blue, gradually changing the color of a light source and black body with the same time, we the absolute temperature of the blackbody was known as the light source of color temperature.
Different color temperature light source, light colors are different:
Following in the 3300K color temperature, light red color cast give a warm feeling; a stable atmosphere, warm feeling;
Color temperature in the 3000 - 6000K for the middle, not in this tone was particularly evident under visual psychological effect, a refreshing feeling; so called "neutral" color temperature.
Color temperature more than 6000K, light bluish color, gives a cool feeling
a. the color temperature and brightness, high color Wen Guangyuan irradiation, such as the brightness is not high then there is a yin to the atmosphere of the people; low color Wen Guangyuan irradiation, the brightness is too high people will have a hot feeling.
b. light color contrast in the same space using two large sources of light color, its contrast will be a level effect, light color contrast is large, the brightness level access to the same time, the level of available light color.
Low color Wen Guangyuan exposure, make red more vivid;
Wen Guangyuan irradiation by the color, so blue with the cool feeling;
Irradiation with high color Wen Guangyuan, so objects with cold feeling.
Color rendering: Color rendering of light on the object itself as the color of the extent, that is, the degree of color fidelity; color rendering of the color index from that, it said that under the color of objects in the light than the reference light (the sun light) illumination color deviation, can more fully reflect the color characteristics of light. High color rendering light source on the color of good performance, we see the color also close to the natural color, low color light source on the color of poor performance, we see the color deviation is also larger. International Commission on Illumination CIE color rendering index of the sun as 100 types of light sources of different color indices, such as: high pressure sodium color rendering index Ra = 23, fluorescent tubes color rendering index Ra = 60 ~ 90.
Luminous efficiency: an important indicator to measure light energy is divided by the light source luminous flux given the power consumed. Unit: lumens / watt (lm / w).
Two types of color
Faithful color: correctly show the original color of material need to use color-rendering index (Ra) of high light source, its value close to 100, the best color rendering.
Color Effects: To clear emphasis on a particular color, reveal the lives of the additive method can be used to enhance the color effect.
Glare: Vision of a high brightness of the brightness of an object or a strong contrast, it can cause visual discomfort referred to as glare. Glare into disabling glare and discomfort of glare, glare is an important factor affecting the quality of lighting.
Electromagnetic interference: gas discharge lamp ballasts in use, the Council of radiation, conduction, etc. to the surrounding electrical interference.
Electromagnetic noise: electrical work around the anomaly may even get out of control.
Average life expectancy: 50% light damage time.
High contrast: The Object and the difference between the background brightness of the background brightness and contrast ratio as brightness, contrast affect the visibility of the object. Comparison of large objects easily be observed, and to generate short-range in the visual sense of excitement.

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