The history of white leds ( A) : exclusive monopoly collapse, bringing in the competition era of the history of white leds ( 2) The history of white leds (battlefield from the court to market 3) Equipped with LED products increase, expanded the history of white leds ( 4) Will threaten in the bud
from 2005 to 2006, using white light-emitting diode ( 领导) Lighting appliance into reality. 'Composed of high power white LED lighting appliance not inferior in fluorescent lamp' ( Citizen electronics) 。 LED manufacturers and lighting appliance manufacturers' confidence for two reasons. One is more than 60 lm/W white LED luminous efficiency will be came out, the light of actual use efficiency will more than fluorescent lamps. Fluorescent lamp luminous efficiency is 80 lm/W ~ 100 lm/W, in spite of the high value, but because the light is all light, so there will be a waste. And white leds only to encapsulate the front of the light, so the light use efficiency in 60 ~ 70 lm/W lm/W, the practical efficiency will be higher than 100 lm/W fluorescent lamp '( Toshiba lighting technology) 。
the second reason is that with the increase of luminous efficiency, each high power white LED the luminous flux of more than 60 lm. Thus to number less than 50 white leds have the same as a fluorescent lamp luminous flux. Then 'lighting appliance design flexibility will also raise' ( Lumileds Lighting Japan ( At the time) ) 。 For example, can easily in the limited embedded LED light-emitting surface. Hence, manufacturers began to develop power consumption is less than the fluorescent lamp, lighting fixtures of installation site has high flexibility and shape. 1000 to 50
the white leds have been regarded as 'will be lighting appliances light' in the future. But the reality is that white leds do not have enough power to destroy mainly products equipped with fluorescent lamps lighting appliance market. The reason is that due to the low luminous efficiency, power consumption is large, can be obtained from an LED light flux is small, so the size of the lighting fixtures.
so, white leds are thinking about the size of the market as much as 1 trillion yen of lighting market, but it is first developed for mobile phones back according to the small power of the light source products. Small power white LED, in the second half of 2004 the luminous efficiency of 50 lm/W products come out, but you want to use this kind of small power products with a single fluorescent lamp equal flux reach 3000 lm, need about 1000 LED. Many lighting appliance manufacturers agreed that 'will be used for general illumination appliance is not reality'. Although you can also use a single flux for lm 20 ~ 30 lm high-power products, but only 30 lm/W, luminous efficiency is only about one-third of fluorescent lamps, small power products about half, so not only do big power consumption, and need to install the cooling device for cooling. Therefore, after the development of white LED light, though in some bright lights case tens of thousands of hours of life, is very attractive, but can only be used for some special lighting appliances in the market.
but, high-power white leds through the adoption of flip chip packages in small power products such as the accumulation of technical know-how, rapidly solve the previous issue. Many view, 'luminous efficiency reach 60 lm/W will be a turning point, for the lighting equipment manufacturers, high power white leds will quickly become easily using the products'.
assumptions used for lighting purpose, the input power for level 1 w white light-emitting diode ( 领导) , 2005 ~ 2006 luminous efficiency will be more than 60 lm/W, a) 。 At 60 ~ 70 lm/W lm/W, can be like 100 lm/W fluorescent lamp, reduce lighting power consumption of the appliance. Lighting of white leds starting to catch up with or exceed the fluorescent lamps, light use efficiency so as to improve the color rendering index and reduce the cost for the purpose of the development of white LED lighting will also speed up the pace, b) 。 Propeller is white LED lighting products of technology, white leds demonstration in positive cycle is about to begin. For lighting USES the accumulated technique can be applied to the mobile phone with the small power products such as LED.
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