(1) Energy conservation: The spectrum of LED is almost entirely concentrated in the visible light band, and its luminous efficiency can reach 80-90%. The author also compares LED with ordinary incandescent lamp, spiral energy-saving lamp and T5 three-color fluorescent lamp. The results show that the luminous efficiency of ordinary incandescent lamp is 12lm/w, the life is less than 2000 hours, and the luminous efficiency of spiral energy-saving lamp is 60lm. /w, the life is less than 8000 hours, the T5 fluorescent lamp is 96Alm/w, the life is about 10000 hours, and the white LED with a diameter of 5 mm is 20-28 lm/w, and the life can be more than 100000 hours. Some people also predict that the future LED life limit will be infinite.
Most people think that energy-saving lamps can save 4/5 energy is a great initiative, but LED fluorescent lamps are even more energy-saving than energy-saving lamps, which is a greater reform of solid-state light sources. In addition, LED has other advantages, high light quality, basically no radiation, is a typical green lighting source; reliable and durable, extremely low maintenance costs and so on. Just because LED has the characteristics that other solid light sources can't match, LED will be the mainstream light source in the lighting industry after 10 years.
(2) Safety and environmental protection: The working voltage of LED is low, mostly 1.4-3V; the working current of ordinary LED is only 10mA, and the ultra-high brightness is only 1A. LED does not need to add "mercury" in the production process, does not need to be inflated, does not need glass casing, good impact resistance, good shock resistance, not easy to break, easy to transport, very environmentally friendly, known as "green energy."
(3) Long service life: The LED is small in size and light in weight, and the outer casing is epoxy resin package, which not only protects the internal chip, but also has the ability of light transmission and concentrating. The service life of LEDs is generally between 50,000 and 100,000 hours. Because LEDs are semiconductor devices, even frequent switching will not affect the service life. At present, household lighting mainly uses incandescent lamps, fluorescent lamps and energy-saving fluorescent lamps.
(4) Fast response speed: the response frequency fτ of the LED is related to the lifetime τmc of the minority carrier. For example, the LED made of GaAs material has a τmc of 1 to 10 ns, and the response frequency is about 16-160 MHz. Such a high response frequency is sufficient for displaying a 6.5 MHz video signal, which is one of the key factors for realizing a large LED Screen .
At present, the LED response time has reached a minimum of 1 microsecond, generally a few milliseconds, which is about 1/100 of the response time of an ordinary light source. Therefore, it can be used in many high-frequency environments, such as car brake lights or status lights, which can shorten the braking time of the vehicles behind the car, thus improving safety.
(5) High luminous efficiency: the luminous efficacy of incandescent lamps and tungsten halogen lamps is 12-24 lm/w (lumens/watt), the luminous efficacy of fluorescent lamps is 50-70 lm/w, and the luminous efficacy of sodium lamps is 90-140 lm/w. Most of the power consumption becomes heat loss. The luminous efficacy of the LED can be improved to 50-200 lm/w, and the monochromaticity of the light is good, the spectrum is narrow, and the visible light can be directly emitted without filtering.
(6) The small size of the LED components: it is more convenient for the arrangement and design of various devices, and can better realize the effect of “seeing the light without seeing the light source†in the night scene lighting.
(7) LED light energy concentration is high: concentrated in a small wavelength window, high purity.
(8) LED light directivity: brightness attenuation is much lower than traditional light sources.
(9) LED low-voltage DC can be driven: it has the advantages of small load and weak interference, and has low requirements on the use environment.
(10) It is better to control the composition of the luminescence spectrum: it can be used well for local or accent lighting in museums and exhibition halls.
(11) It is possible to control the size of the semiconductor light-emitting layer and the semiconductor material to prohibit the width of the strip: thereby emitting light of various colors and having a higher chroma.
(12) High color rendering: it will not cause harm to the human eye.
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