LED basic lighting terms
Flux: the symbol, lumen Lm: luminous body every second emitted light total light flux.
Light intensity: the symbol I, unit candela CD Description: luminous flux, luminous position in a particular direction of single solid angle emission.
Illumination: the symbol E, lux Lm/m2 unit description: light irradiation, the luminous flux in the unit area of the illuminated objects.
Brightness: the symbol L, Nituo unit cd/m2, luminous flux in that particular direction unit solid angle per unit area.
Light efficiency: Unit
Lumens per watt Lm/w, indicating that the ability of the electric light source to convert electrical energy into light, divided by the amount of light emitted by the power consumption.
Life expectancy: unit hours, indicating the number of hours of damage to a number of bulbs to fifty percent.
Economic life: unit hours, indicating that the beam output is reduced to a specific number of hours at the same time considering the damage of the bulb and the attenuation of the beam output. This ratio for outdoor light source is seventy percent for indoor light sources such as fluorescent lamp is eighty percent.
Color temperature: the color of the light emitted by the light source is the same as that of the blackbody at the same temperature. The light source color temperature is different, the color is also different, the color temperature below 3300K has the stable atmosphere, the warm feeling; the color temperature in 3000 - 5000K is the intermediate color temperature, has the fresh feeling; the color temperature has the cold feeling above 5000K. Different light sources of different light and color composition of the best environment, color temperature >5000k: light color for cool type (with blue white), cold atmosphere effect; color temperature in the 3300-5000K: light color for the middle (white), refreshing atmosphere.
Color: the color of the light source is a color index to indicate that it represents the object in the light color than the quasi light (sunlight) lighting color deviation can comprehensively reflect the color of light source. The color is divided into two kinds: true color, color can correct the performance of the original material to use the color index (Ra) high light source, its value is close to 100, the best color; color effect, to clearly emphasize specific color, show the beauty of life can use the additive method to enhance color effect. Because of the difference in the composition of the light spectrum, therefore, even if the same color, the color of the lamp may be different.
Luminaire efficiency: also called the light output coefficient, is an important standard to measure the energy efficiency of the lamp. It is the ratio of the light energy output from the lamp and the light energy output.
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