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¡ù The relation between seeing and light
¡ö Seeing information
In these so-called five sense functions,see
(87%), listen (7%), smell (3.5%), touch (1.5%),
taste (1%), the information received through
the seeing accounts for 87%. We will obtain
a lot of information by eyes in our daily life, it
is very difficult to see the things in the dim
place; and can't see the things clearly and
accurately in the bright shaking place either.
¡ö The seeing reaction
Speak it for self; someone can't see things
without light. Eyes convert the stimulation
from light into signals. These signals arebeing transferredto brain through millions of
optic nerves; then the brain judges these signals and executes the seeing reaction to reco
gnize brightness, colors and shapes.
¡ù Natural light and artificial light
¡ö Spectrum (Divided lights)
    
In case of making the natural light shines on the screen through the prism, lights can be
divided into purple, blue,dark green, green, yellowish green, yellow, orange, red, which are
similar to the rainbow colors. Such stripe pattern is called as the spectrum or divided lights

of visible light, which directly mirror the color compositions of light.
     
 
¡ö Visible light
 
The lights of the visible light are the electromagnet
  
ic wave that is under therange of 380-780nm (bicron),  
which makes the bright feeling for our eyes.
  
 
¡ö Infrared ray¡¤ultraviolet ray
  
In the lights that can't be discerned by people'seyes,
  
infrared ray or called the health line makes people
  
's muscles feeling warm, and ultraviolet ray
 
causestanned effects and chemical reaction  
effects. These two kinds of light can beapplied to  
differentfields separately.
  
 
¡ö Standard relative spectral sensitivity
  
(Photopic seeing)
  
In the visible lights, as the difference of wavelength
  
.lights can be divided into various compositions of
 
light color, with different feelings to the
 
brightness.For example, yellow or green makes som
 
eone to be felt bright, while red or blue makes dim.
 
Even for the lights with the same energy,different feelings of eyes will be caused by the  
different wavelength of light too. The brightest lightsfor human eyes are the yellow-green  
series lights (wavelength about 555nm). As the right form shows, set the brightness 1 to the  
wavelength of 555nm light, the compared value between light brightness of other  
wavelength with this one, being called the standard relative spectral sensitivity.  
 
 
     
¡ö Natural light
¡ö Three primary colors of light
  
The natural light is usually not invariable. In the
Three kinds of color can produce
 
daytime, morning and evening, the luminous intensity
various kinds of colors artificially
  
and light color will be changed a great deal as the
by folding up them, red (R), green (G),
 
different incidence angles and directions. And the
blue (B). If the rate of RGB is changed,
 
y are also influenced by cloud, fog. In addition, the
then the nature of light will be also
 
changes of the sun orbit in each season exert an
changed. Therefore, the rate of mixing
  
influence on natural light. International Commission
RGB is the key point to the influence of  
on Illumination (CIE) regulates illumination of the light color when artificial lights are  
same colors with natural lights ashe standard light made. The outturn light source of using  
. To get a better comparison of colors, JIS primary colors theory to develop is  
regulates the natural condition to get stable "Three wavelength fields shinning  
lights in practice, that is " Sunny, the lights in north fluorescent lamp,that is Tricolor  
part of sky avoiding direct sunshine from three hou
 (Tri-phosphor) lamp.  
rs after the sunrise and three hours before the
 
sunset",called the standard light.  
   
   
   
   
 
 
 
¡ù Illuminant theory of light source
   
¡ö Temperature radiation
    

Temperature radiation is to heat the object to the high temperature, and the light energy is

radiated from this object. In low-temperature zone, if the infrared ray with long radiation
wavelength of radiation heats up to several hundred degrees, the bright visible lights can
be seen by the naked eyes. Incandescent lamp bulb is very a case of this temperature
radiation theory, which sends out visible light by heating up the lamp wires to more than
2,000 degrees.
     
¡ö Exciting light
The molecule or atom form some matter absorb energy from external radiation, reaching the
high energy state (Exciting state), then releaseenergy to the outside in the form of light
again, this kind of radiation light is generally called exciting light. The forms on materials
receivedenergy, it also can be divided into "The electron exciting "and " The heat exciting, etc.
The luminescence of the biological firefly is one of this kindof exciting. The theory of flu
orescent lamp is that electron is made by electricity discharge and flown interactively, the
electronic energy is received by the mercury, then releasing the ultraviolet ray, this kind
of ultraviolet ray is absorbed by the fluorescence body which coasted on the inboard wall,
thus visible lights is converted and being seen by naked eyes and releases out. Therefore,
there are two kinds exciting inside the fluorescent lamp.
 

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