Led display screen

LED by a  fluorescent led tube is super bright LED light source, shell white as shine for yakeli/aluminum alloy. Outer garment, usable PC control thermostability can reach 135 degrees. LED with traditional fluorescent lamp in a fluorescent on all the same caliber envelop dimensions, length 60cm and 120cm, more have three, its power 10W, respectively, and 20W 16W and 20W traditional fluorescent lamp (ballast) about 53W actual power-hungry, 40 w traditional fluorescent lamp (ballast) about 68W actual power consumption.

LED fluorescent lamp T8

[1] definition:

10WLED fluorescent lamp brightness even than traditional 40 w fluorescent lamp, fluorescent light than traditional 16W LED to 64W fluorescent lamp, fluorescent lamp brightness LED bulb light appears more downy more make particularly easy for people to connect to teach. Service life in 5 million - 8 million hours for power supply voltage AC85V - 260V (ac), without QiHuiQi and ballast, start-up quickly, power is small, no stroboscopic, not easy visual fatigue. It not only super energy saving more environmental protection. Is the national green energy-conserving lighting engineering is one of the key development of products, is currently replacing traditional fluorescent lamp's main products.

LED fluorescent lamp installation is simple, it points power inner and outer two kinds, power built-in LED fluorescent lamp when installed, the original fluorescent lamp, fluorescent tubes removed and replaced by leds and QiHuiQi ballast and remove, let 220V directly added to communicate mains supplyicoil LED fluorescent lamp ends can. Power the outer leds fluorescent lamp general equipped with a special lighting fixtures, replacing the original can use.

Saving up to 80% LED fluorescent lamp, life for ordinary tubes, almost 10 times above maintenance free, does not exist often should change fluorescent tubes, ballast, QiHuiQi problem, about six months down the savings can change back to cost. Green environmental protection semiconductor electric light source, the light is downy, the spectrum pure, be helpful for workers eyesight protection and healthy body, the cold illuminant 6000K to person visual sense to cool feeling, helps to concentrate and improve efficiency.

Shine principle:

PN junction terminal of potential barrier, constitutes a certain positive bias voltage when plus home is decline, P area and the majority carrier to each other -- diffusion. Since electronic mobility mobility than cavitation much more electronic, so it appeared to P area diffusion, constitute the minority carriers to P area injected. These electronic and price bring cavity get compound, compound in the form of light energy release out. This is the principle of glowing PN junction.

The luminous efficiency:

Commonly referred to as the external components for the component, the quantum efficiency of internal quantum efficiency and components of the product out efficiency. So-called quantum efficiencies, the internal components of the component itself is in fact lightning conversion efficiency, the main characteristics of itself with components (such as component material band, defect, impurities), component of crystal components and structure home related. And out of components is refers to the efficiency of internal components in photon, produced by the absorption of component itself, refracted, reflection, the actual component to measure external can photons. Therefore, the factors include about remove efficiency the absorption of the components of material itself, the geometrical structure of components of packaging materials, components and the structure of components and refractive index difference scattering properties etc. And the internal components of the quantum efficiency and components of the product is removed, the efficiency of the entire assembly glow effect, also is the component of external quantum efficiency.

Early component development is concentrated in improving its internal quantum efficiency, main methods are crystal by raising the quality and change home crystal structure, make home electric power not easily, then converts it to heat the indirect improve, which LED the luminous efficiency can obtain 70% of theory of quantum efficiency, but such within the internal quantum efficiency has almost close to theoretical limit. In such a situation, by improving the internal components light quantum efficiency is not may improve the total amount of light component, and therefore improve components becomes important take efficiency research topic. At present the main methods of grain appearance is changed - TIP structures, surface coarsening technology.

Electrical properties:

Current control type device, the load characteristics like PN junction UI curve, is the tiny change voltage guide will cause positive current large variations (index level), reverse leakage current is small, have reverse breakdown voltage. In actual use, should choose. LED positive voltage with temperature and smaller, have negative temperature coefficient. LED power consumption, part of it is converted to light energy, this is what we need. The remaining is converted into heat and high temperature. Send out quantity of heat (power) can be expressed as.

The optical properties:

Leds offer is half width big monochromatic, because of semiconductor gap decreased with increasing temperature, so the peak wavelength emit with increasing temperature and growth, namely spectral redshift, temperature coefficient for + 2 ~ 3A /. LED luminance L and positive current approximate proportion for scale coefficients, K. Current increases, luminous brightness are approximate increased. Another luminous brightness are concerned, and environmental temperature, high temperature environment when compound efficiency descend, luminous intensity decreases.

Thermal properties:

Small electrical flow temperature rise, LED is not clear. If the environmental temperature is higher, LED Lord wavelength will redshift, brightness will decline, luminous uniformity and consistency becomes poor. Especially dot matrix, big screen on the reliability of the temperature on the stability of LED, be more remarkable. So heat design is a key point.

Life expectancy:

The LED long hours can light failure cause aging, especially for high power LED to more serious problems, light failure. In the life, to measure the LED by only the damage as LED lamp of the end of life is not enough, should the LED tube light attenuation percentage of life, such as prescribed LED 35%, so more meaningful.

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