The luminous efficiency and external quantum bulb fiction efficiency with the visual sensitivity bu

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The luminous efficiency and external quantum bulb fiction efficiency with the visual sensitivity bulb fiction (sensitivity of the human eye to light) to represent values. The external quantum efficiency is the percentage of photons emitted to the number bulb fiction of LED chips and the outer packaging of the LED relative to the number of electrons flowing through the (current). A combination of a blue LED chip and the white LED phosphor external quantum efficiency, compared to the internal quantum efficiency (number of photons occurs in the LED chip representing the number of electrons flowing through the light emitting bulb fiction layer of the LED chip (current) ratio) , the light extraction efficiency of the chip (the emitted light out of the LED chip to the outside of the proportion), the conversion efficiency of the phosphor (the light emitted bulb fiction by the chip to convert the ratio of the phosphor of a different wavelength) and the light extraction efficiency of the package ( emitted by the LED and a phosphor to light the proportion of the package outside) the product of the decision.
In the future, the 2008 LED manufacturer intends to achieve 100lm / W luminous efficiency, increased to 2010 of 140 ~ 170lm, 2011 年 increased to 150 ~ 200lm / W. In other words, the luminous efficiency ahead of new vendors joined the LED plant's goal is an average increase 30lm / W or more per year for three years to improve 100lm / W. Ceiling LED luminous efficiency is considered to be 250lm / W or so, each LED manufacturers are able to challenge what extent approaching the upper limit. bulb fiction
White LED, for example, in conjunction with the general bulb fiction varieties of blue LED chip and yellow phosphor (average color rendering index Ra of 70 or more), mostly color temperature at 6000K or more daylight color, and additional red phosphor, such as red light bulb color LED 3000K color temperature more in the following. Improved light color phosphors in combination with a blue LED chip, but also get more than 4000K and 5000K color temperature, such as above. bulb fiction Color temperature of the lighting apparatus 可依 places were used. For example, office settings with the sun close to the best, the higher bulb fiction the color temperature of lighting equipment, and general home and close to restaurants and other mostly prefer to use with incandescent, low color temperature of lighting equipment.
Recently, according to the time of day and seasonal variation of dimming products have achieved. For example, Japanese Okamura listed for fine adjustment using the LED lighting bulb fiction system. Characterized by having about a day in accordance with the body clock cycle and regularly changing the color temperature of the illumination function. Preset dimming procedure every day for a year, in accordance with changing times and seasons, so that the illumination in the range of 400 ~ 800lx five stages, the color temperature varies within the range of 3000 ~ 5000K five stages. This allows people to wake up in the morning according to daytime activities, night sleep natural environment periodically dimming. People have a more comfortable lighting environment, able to work more efficiently.
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