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Selling price: LED's are expensive, when compared with incandescent lighting fixtures, a few LED's price around the price having an incandescent lamp instead, each signal normally require from the previous 300 to 500 diodes. 3, monochromatic LED types and history The initial application of rules of semiconductor PN penetration light-emitting LED light source made of 62 came in earlier 20th hundred years. The material is then used GaAsP, hair reddish colored ( p = 650nm), the push current of 20 mum, the luminous flux of just one or two lumens each thousand, the corresponding luminous efficiency around 0. 1 lumens / watts. Mid-70s, the development of portions of In and N, to generate natural LED ( p sama dengan 555nm), yellow ( p sama dengan 590nm) and lemon ( p = 610nm), optical performance is also increased to 1 lumen / volt. To the beginning 80s, appeared within the LED source of light GaAlAs make the red LED gentle efficiency of ten lumens / watts. Earlier 90s, hair, red and yellowish of GaAlInP and tresses green, glowing blue GaInN developed two fresh materials to make DIRECTED light effect was greatly improved. In 2050, the former is made from LED inside red and orange zone ( p sama dengan 615nm) light efficiency in order to 100 lm / N, which made the green LED in your community ( l = 530nm) light productivity can reach 55 lm / watts. Fourth, the use of monochromatic BROUGHT Initially used as musical instruments of instruction LED light source, then lots of light-colored LED in traffic lights and large screens from the widely used and produced good economic along with social benefits. In order to 12-inch red traffic lamps, like might have been found in the United States longevity, low-light 140-watt amoureux effective as the light source, it generates 2000 Lumens of whitened. The red filter, the optical lack of 90%, simply 200 lumens of reddish light. In light of the brand new design, Lumileds provides a red DIRECTED light source eighteen, including circuit loss, including a entire power of 14 w of light produce the same impact. Automotive LED signals are also important areas of light program. In 1987, China started to install high vehicle brake lights, GUIDED response as quick (nanosecond), is really as early as you can in order that the trailing motor vehicle drivers know that generating performance and reducing posterior accident. In addition, LED lighting at the outdoor reddish, green, azure full-color display, little flashlight key chain happen to be the areas of application. Sixth, the creation of white BROUGHT For general lighting effects, the white gentle that people need. 1998 white gentle LED developed. Here is the GaN BROUGHT chip and yttrium light weight aluminum garnet (YAG) made bundle together. GaN computer chip of blue ( p = 465nm, Wd = 30nm), created from high-temperature sintering associated with YAG phosphor that contains Ce3 + excited with this blue light following the yellow emission top 550nm. Blue BROUGHT substrate installed from the reflective cavity dish, cover which has a blend of YAG thin level of resin, regarding 200-500nm. Issued azure LED substrate to some extent phosphor absorbed, plus some blue combined with yellow phosphor granted, can be also white. Today, for your InGaN or YAG white DIRECTED, YAG phosphor by simply changing the chemical arrangement and adjust the thickness of the phosphor level, available colors and color temperature 3500-10000K whitened.

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