新葡的京集团3522vip-www.350.vip

新葡的京集团3522vip
Shop
Your location:Home > English > Service > Lighting knowledge >
Lighting knowledge
Adddate:2017-09-08 16:40????Hits:
 One, light
Light is a form of energy. The essence of light is electromagnetic wave, which is a part of the whole electromagnetic spectrum.
Visible light: a part of the radiant energy emitted by a light source that produces visual radiant energy, often referred to as visible light".
Wavelength of visible light: from 380nm----780nm
Ultraviolet wavelength: invisible from 100nm---380nm to the naked eye.
Infrared wavelength: from 780nm---1mm, invisible to the naked eye.
Two luminous flux (LM)
The light source radiates out of the surrounding space at unit time and produces light sensitive energy to the human eye
Three, light source efficiency (lm/W) calculation formula: Phi lambda =683P lambda V lambda
Luminous flux, lumen (LM) in a lambda lambda lambda lambda;
P radiation flux of lambda lambda (radiant energy emitted per unit time, W);
V spectral efficiency of lambda lambda lambda;
683 - maximum spectral luminous efficiency, for bright vision, at lambda =555nm, the value is 683lm/W.
Such as polychromatic light, its light flux is the sum of each monochromatic light, that is, phi, n=, phi, 1+, phi, lambda, 2+... =Km sigma [P lambda V lambda]
Represents the lumen of a light source that consumes one watt of electricity per watt, as well as the luminous efficiency.
Light efficiency is an important index to measure the luminous efficiency of light source.
Four, luminous intensity (CD)
The luminous flux emitted by a light source in a solid angle of a unit in space.
Calculation formula: I theta = Phi / Omega, I theta - light intensity in theta direction;
The luminous flux (LM) received by a spherical A;
The solid angle Omega corresponding spherical (Sr), namely the ball surface area S on the centre of the angle formed by the ratio of radius, surface area of S square and ball metric, Omega =A/r2.
Five, illuminance (LX)
Accept the luminous flux per unit area is face to face
Calculation formula: E= Phi / A
Type E - in the illuminated area on the illumination, lux (LX);
The luminous flux (LM) received on a A area;
A - the area of acceptance of luminous flux;
When the light source is smaller than the diameter of it is to face distance 1/5, the light source as a point source.
  
Six, brightness (cd/m2)
The luminous intensity of a unit area in the line of sight
Formula: due to a luminous image on the retina formed by visual sensation and retina image illumination is proportional to the intensity bigger, we feel more bright; and the image of the light illumination and projection area in the line of sight is inversely proportional with the luminous body in the direction of the light intensity into sight is it:
L =I / (Scos)
L - emitting surface brightness along the direction of the type (cd/m2);
- emitting light intensity along the direction of the body (CD);
Scos - light projection body in the line of sight direction on the surface (M2);
Of all the photometric quantities, brightness is the only direct cause of visual perception in the eye.
Seven, color temperature (K)
A standard blackbody heating, with the increase of temperature of blackbody color gradually changed along the red - red - Orange - yellow - white - blue, black color and standard when a light emitted by the light source at a temperature of the same color, we will at that time known as the absolute temperature of blackbody light source color temperature, expressed as absolute temperature K.
Eight, color rendering
The degree to which an illuminant presents its color is called color rendering, usually called the color rendering index (Ra).
It is the degree of color fidelity. High color rendering of light sources for color performance is better, the colors we see is close to the natural color, color light color low color of poor performance, the color deviation of what we see.
According to the international Illumination Committee CIE, the color rendering index of sunlight is Ra 100, and the color rendering indices of various types of light sources vary.


下一篇:没有了
Picture information
Contact us
+More
Zhongshan City Sheng Xi Lighting Co., Ltd.
Address:Two Zhongshan Road, new town Henglan Mao Industrial Zone Kanglong No. 6 two four floor
Tel:0760-88899205
Mobile:15918213266
E-mail:shengxizm@163.com
Shop
  • 新葡的京集团3522vip
  • 新葡的京集团3522vip
  • 新葡的京集团3522vip
  • 新葡的京集团3522vip
新葡的京集团3522vip
WeChat public number
WeChat sweep
Contact us
Tel:400-85456985
E-mail:shengxizm@163.com
新葡的京集团3522vip
XML 地图 | Sitemap 地图