LED fluorescent lamp LED fluorescent lamp is made of super bright LED white light as the light source, and the outer casing is acrylic/aluminum alloy. The cover can be made of PC tube and has a high temperature resistance of 135 degrees. LED fluorescent lamps and traditional fluorescent lamps are the same in size and size. They are 60cm, 120cm and 150cm in length, and their power is 10W, 16W and 20W respectively. The actual power consumption of 20W traditional fluorescent lamps (inductive ballasts) is about 53W. , 40W traditional fluorescent lamp (inductive ballast) actual power consumption is about 68W.
LED fluorescent light T8
[1] Definition:
The brightness of the 10W LED fluorescent lamp is brighter than the traditional 40W fluorescent lamp. The 16W LED fluorescent lamp is brighter than the traditional 64W fluorescent lamp. The brightness of the LED fluorescent lamp is especially softer and makes it easier for people to receive. The service life is 50,000-80,000 hours. The power supply voltage is AC85V-260V (AC). It does not need a starter and ballast. It has fast start-up, low power, no stroboscopic, and it is not easy to see fatigue. It is not only super energy saving but also more environmentally friendly. It is one of the key products developed by the national green energy-saving lighting project and is the main product that replaces the traditional fluorescent lamp.
LED fluorescent lamp installation is relatively simple, it is divided into two types of power supply built-in and external. When the built-in LED fluorescent lamp is installed, the original fluorescent lamp is removed and replaced with LED fluorescent lamp, and the ballast and the starter are removed, so that 220V AC The mains can be directly added to the ends of the LED fluorescent lamp. The external LED lamp of the power supply is usually equipped with a special lamp holder, and the original one can be used.
LED fluorescent lamps can save more than 80% of electricity, and the lifespan is more than 10 times that of ordinary lamps. It is almost maintenance-free. There is no problem of replacing lamps, ballasts and starters frequently. The cost saved in about half a year can be saved. Exchange back the cost. Green and environmentally friendly semiconductor electric light source, soft light, pure spectrum, is conducive to workers' vision protection and health. The 6000K cold light source gives people a visually cool feeling, which helps to concentrate and improve efficiency.
Principle of illumination:
The terminal voltage of the PN junction constitutes a certain barrier. When the forward bias voltage is applied, the barrier decreases, and the majority carriers in the P and N regions diffuse toward each other. Since the electron mobility is much larger than the hole mobility, a large amount of electrons diffuse into the P region, which constitutes injection of minority carriers in the P region. These electrons recombine with the holes on the valence band, and the energy obtained during recombination is released as light energy. This is the principle of PN junction illumination.
Luminous efficiency:
Generally referred to as the external quantum efficiency of a component, it is the product of the internal quantum efficiency of the component and the extraction efficiency of the component. The internal quantum efficiency of a component is actually the electro-optic conversion efficiency of the component itself, which is mainly related to the characteristics of the component itself (such as the energy band, defects, and impurities of the component material), the composition and structure of the component. The extraction efficiency of the component refers to the number of photons that can be measured outside the component after the photons generated inside the component are absorbed, refracted, and reflected by the component itself. Therefore, the factors concerning the extraction efficiency include the absorption of the component material itself, the geometry of the component, the refractive index difference of the component and the packaging material, and the scattering characteristics of the component structure. The product of the internal quantum efficiency of the component and the extraction efficiency of the component is the luminous effect of the entire component, which is the external quantum efficiency of the component.
Early component development focused on improving its internal quantum efficiency. The main method is to improve the quality of the barrier crystal and change the structure of the barrier crystal, so that the electrical energy is not easily converted into thermal energy, thereby indirectly improving the luminous efficiency of the LED, thereby obtaining a theory of about 70%. Internal quantum efficiency, but such internal quantum efficiency is almost close to the theoretical limit. Under such circumstances, it is impossible to increase the total amount of light of the module by increasing the internal quantum efficiency of the module. Therefore, it is an important research subject to improve the extraction efficiency of the component. The current method is mainly: the change of grain appearance - TIP structure, surface roughening technology.
Electrical characteristics:
The current-controlled device has a load characteristic similar to the UI curve of the PN junction. A very small change in the forward conduction voltage causes a large change in the forward current (exponential level), a small reverse leakage current, and a reverse breakdown voltage. In actual use, it should be chosen. The LED forward voltage becomes smaller as the temperature increases, with a negative temperature coefficient. The LED consumes power and a part of it is converted into light energy, which is what we need. The rest is converted to heat, which causes the junction temperature to rise. The amount of heat (power) emitted can be expressed as.
Optical characteristics:
The LED provides monochromatic light with a large half-width. Since the energy gap of the semiconductor decreases with increasing temperature, the peak wavelength emitted by the semiconductor increases with temperature, that is, the spectrum is red-shifted and the temperature coefficient is +2. The ~3A/.LED luminance L is approximately proportional to the forward current: K is the proportionality factor. As the current increases, the luminance of the light also increases approximately. In addition, the luminance of the light is also related to the ambient temperature. When the ambient temperature is high, the composite efficiency is lowered and the luminous intensity is decreased.
Thermal characteristics:
Under low current, the LED temperature rise is not obvious. If the ambient temperature is high, the main wavelength of the LED will be red-shifted, the brightness will decrease, and the uniformity and consistency of the light will be deteriorated. In particular, the temperature rise of the dot matrix and the large display screen has a more significant effect on the reliability and stability of the LED. So thermal design is critical.
life:
Long-term operation of LEDs will cause aging due to light decay, especially for high-power LEDs, the problem of light decay is more serious. When measuring the life of an LED, it is not enough to use the damage of the lamp as the end of the life of the LED. It is more meaningful to specify the lifetime of the LED by the percentage of light attenuation of the LED, such as 35%.
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