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1, Lumen maintenance?
It is the ratio of  luminous flux in a specific period during the life time to initial luminous flux.


2,Color rendering?
It isEffect of an illuminant on the color appearance of objects by conscious or subconscious comparison with their color appearance under a reference illuminant. Color Rendering Index is a quantitative measure of the ability of a light source to reproduce the colors of various objects faithfully in comparison with an ideal or natural light source.


3,Correlated color temperature?
It is a measure of the "shade" of whiteness of a light source, again by comparison with a blackbody. CCT less than 3300K is warm white, between 3300K-5000K is natural white, more than 5000K is warm white.


4,Economic life time?
Considering the damage of lamps and decay of beam, the time that integrated beam decay to a special situation, unit is hour. This rate for outdoor light source is 70%,for indoor is 80%.


5,Life expectancy?
The time that half of the lights be damaged, unit is hour.


6,Luminous efficacy?
It is afigure of merit forlight sources. It is the ratio ofluminous flux (inlumens) topower (usually measured inwatts).unit is Lm/w.


It is aphotometric measure of theluminous intensity per unit area oflight travelling in a given direction. It describes the amount of light that passes through or is emitted from a particular area, and falls within a givensolid angle.sign is L, unit is nit or cd/m2.


It is the totalluminous flux incident on a surface, per unitarea. Sign is E, unit is lux.


9,Luminous intensity?
It is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle. Sign is I, unit is Candela.


10,Luminous flux?
It is adjusted to reflect the varying sensitivity of the human eye to different wavelengths  of light. Its sign isΦ,unit is Lm.


11,Invisible light?
Relative to visible light, wavelength less than 380nm or more than 780nm is invisible light.lights whose wavelength less than 380 nm are ultraviolet,X ray, R ray,etc. More than 780nm are infrared, radio wave.


A spectrum (plural spectra or spectrum) is a condition that is not limited to a specific set of values but can vary infinitely within acontinuum. The word saw its first scientific use within the field of optics to describe the rainbow of colors in visible light when separated using a prism.


13,.Light and radiation?
It is electromagnetic radiation, particularly radiation of a wavelength that is visible  to the human eye about 380nm-760nm.