Optical knowledge and........
[ Illuminant kind ] ： The illuminant is different according to glowing component/ principle , can be that the illuminant , among them representative pointolite have a light-emitting diode mark count the illuminant , the line illuminant kneading dough (LED) and so on；If the fluorescent lamp tube, is a cold cathode, the fluorescent tube (CCFL) waits for the line illuminant; The illuminant has OLED , the inorganic glowing TDEL/ EL component;
[ Light flux ] ：Be the rate being on the move emitted the rate or brightness glorifying an energy by one illuminant , be to explain that fundamental glowing ability of illuminant amounts , unit are a stream Ming Dynasty (Lumen).one The earthen (w) light bulb of l00 may produce l750lm, but 40 white cold one w fluorescent tubes may produce 3 l5Olm light flux then.。
[ Luminescence intensity ] ：Be called luminosity for short , be to speak from light flux emitted by a illuminant solid angle (the unit is Sr) , be just light flux issued by illuminant or illumination lamp Distribute density , the unit on selected direction of space being candela (cd). The luminescence intensity is that 1 cd illuminant may emit l2.57lm light flux.
[ Illuminance ] ：Be the density accepting light flux on the flat surface to be cast light on , to be come measure every units area available light flux. The llm light flux scatters homogeneously in l square meter of (m2) Be to produce 1 new Leke (LUX outside,the lX) illuminance 1 lm light flux gets the surface in foot (ft2) of l square , whose illuminance value is l ruler candela (Footcandle , fC). The table top , the face illuminance do not respond to less than 150 lX. Lamp manages that illumination adopt the soft small side door of light half direct type illumination of living room comparatively Think of, whose average illuminance should reach the l00lX retinue. The lamp power reading and writing use is a little big , the illuminance should reach 200 lX.
[ Colour temperature ] ：Be all called white light , the naked eye seems in fact in brightness issued by our in self's eyes most illuminant to be unlike white light sent out by illuminant may present because of the colour temperature height Show different colour. Photochromic is more slanting blue, that the more the colour temperature are taller than being partial to red is that the colour temperature is lower. People's eye will be no big by self what feeling deceives , feels difference sometimes, Can see the most direct effect but on shooting a photograph in us,casting light on supposing that photograph shooting under empty space in eyeball, may possibly enamel feeling chilly, but shoots under lamp light Movie (do not turn on a flash lamp) , orange red that can display obvious warm colour tone.
[ Illuminant efficiency ] ：The illuminant efficiency is value of getting rid of with it's power consumption gains with stream Ming Dynasty made up by whose. Illuminant efficiency (Lm/w) = flows to understand (Lm)/ power consumption (W) is just that amounts , the person numerical value made up by every tile electric power is increasingly tall indicating that the illuminant efficiency exceeds High , be energy conservation also increasingly. Therefore efficiency is general be a important factor that we often ask to think.
[ Kind efficiency ] ：Filament lamp l5/ quartz halogen light 25/ SL provinces type fluorescence light bulb 65/ mercury lamps 70/ average fluorescent tubes 60
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