Luminous Flux：The total quantity of light which be sent out secondly by light source, to say briefly is Luminous Flux. Unite: Lumen(lm)

Illumination: The incidence of luminous flux in unit’s area, that is the value of luminous flux divided by area. The illumination can be divided into horizontal and vertical illumination. Horizontal illumination is the horizontal incidence of the luminous flux, and the vertical illumination is the vertical incidence of the luminous flux.

Light intensity: sign: I, unite: cd, instruction: The luminous body radiates the luminous flux in the solid angle of specific direction.

Luminance:: sign: L, unite: cd/m2, ?instruction: Luminous body radiates luminous flux in unit’s area of solid angle of specific direction.

Luminous effect: unite: lm/w, instruction: The electric light source turns the electric energy into light ability, show with the sent out luminous flux divided by power consumption.

Life Expectancy: unite: hour, instruction: The hour number when 50% of the quantity is damaged of a batch of bulbs.

Economic Life: unite: hour, instruction: The comprehensive light beam output reduces to one specific hour number when under considering the damage of the bulb and the decaying state of the light beam export. It is 70% when this proportion is used in the indoor light source, and 80% in the outdoor, such as fluorescent lamp.

Color Temperature: Show with absolute temperature K., heat namely one standard boldface, the color change gradually when the temperature rise to a certain degree, from crimson to pale red to orange to white and to blue. When some light source is the same as the color of the boldface, we call that absolute temperature the color temperature of this light source. Two light source which have same color temperature may differ in the appearance, as the correlated color temperature is opinion score for light source when the boldface radiation close to it, it is not a kind of accurate color temperature. Only color temperature unable to understand the ability of coloring in the object of light source, or how the color reproduction under this light source.

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