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In 60 s last century, science and technology workers take advantage of semiconductor PN junction light-emitting principle, develop the light-emitting diodes. The material of the LED at the time is GaASP, its luminous color in red. After nearly 30 years of development, everybody is very familiar with LED, and it can emit red, orange, yellow, green, blue and so on a variety of colours. However, illumination of white light leds only developed later in 2000, here led manufacturer China will introduce it to readers about the lighting white LED. The earliest application of semiconductor p-n junction light-emitting principle made of light sources was available in the early 1960 s. That time its materials were used in the GaAsP, red glow. When the drive current is 20 mah, luminous flux only several lumens per thousand, corresponding luminous efficiency is about 0.1 lumens/watt. In the early 90 s, the red light, yellow light and green, and blue light of the GaInN , successful development of the two kinds of new materials make LED the luminous efficiency are improved greatly. In 2000, the former made of leds in the red, orange lights up to 100 lumens per watt, while the latter is made of LED lighting in the green area can reach 50 lumens/watt. Led fluorescent lamp with high quality, durable, energy saving as the main characteristics, projection Angle adjusting range is big, and its brightness is 15 w which equivalent to ordinary 40 w fluorescent lamp. It is temperature resistance, moistureproof and waterproof, leakageproof. Using voltage: 110 v, or 220 v, clothing optional is glass or PC material. Here led manufacturer China compares LED fluorescent lamp with fluorescent lamp, the advantages are as follows: 1, energy saving, 2, long service life, 3, good applicability, due to the volume of a single star LED which can be made into any shapes. 4, short response time, it is the ns (ns) level of response time, while the common lamps and lanterns is ms response time (milliseconds) level. 5, environmental protection, no harmful metals, waste easy to recycling. 6, colorful color and pure, narrow spectral range, and can pass the red, green and blue three primary colors mixed color into 7 colours or white light. Disadvantages: 1, the price is expensive. 2, has the very big disparity efficiency theory and light efficiency. 3, can achieve the life and theory of life also has the very big disparity (10 w hours). 4, there are still a certain calorific value. 5, light failure can also be greatly narrowed.
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