LED fluorescent lamp related knowledge

LED fluorescent lamp LED fluorescent lamp is the use of ultra-bright LED white light as the light source, the shell is acrylic/aluminum alloy. The housing can be made of PC control and can withstand 135 degrees of high temperature. LED fluorescent lamp and traditional fluorescent lamp in the size and caliber are the same, the length of 60cm and 120cm, 150cm three kinds, their power is 10W, 16W and 20W respectively, and 20W traditional fluorescent lamp (inductive ballast) actual power consumption is about 53W, 40W traditional fluorescent lamp (inductive ballast) actual power consumption is about 68W.

Definition:

10WLED fluorescent lamp brightness is brighter than the traditional 40W fluorescent lamp, 16WLED fluorescent lamp brightness is brighter than the traditional 64W fluorescent lamp, LED fluorescent lamp brightness is especially softer and easier for people to receive. The service life is 50,000-80,000 hours, the power supply voltage is AC85V-260V (AC), no need of glow starter and ballast, quick start, low power, no stasmoscope, not easy to see fatigue. It’s super energy efficient and environmentally friendly. It is one of the key products of national green energy-saving lighting project, and is the main product to replace the traditional fluorescent lamp at present.

LED fluorescent lamp installation is relatively simple, it is divided into two kinds of power supply built-in and external, the power supply built-in LED fluorescent lamp installation, the original fluorescent lamp will be removed to replace LED fluorescent lamp, and the ballast and the glow generator removed, so that 220V ac municipal power directly added to the LED fluorescent lamp at both ends can be. Power supply external LED fluorescent lamp is generally equipped with a special lamp frame, the replacement of the original can be used.

LED fluorescent lamp power saving up to 80%, life for ordinary lamp tube more than 10 times, almost free maintenance, there is no need to often replace the lamp, ballast, glow, about half a year down to save the cost can be changed back to cost. The green and environment-friendly semiconductor electric light source, with soft light and pure spectrum, is conducive to the visual protection and physical health of workers. The cold light source of 6000K gives people a cool and refreshing feeling in the vision, which helps to concentrate and improve efficiency.

Luminous principle:

The voltage at the end of PN junction forms a certain potential barrier. When the forward bias voltage is applied, the barrier decreases, and most carriers in P and N zones diffuse to each other. Since the electron mobility is much larger than the hole mobility, a large number of electrons will diffuse into the P-region, constituting the injection of minority carriers in the P-region. These electrons combine with holes in the valence band, and the resulting energy is released as light energy. That’s how the PN junction emits light.

Luminous efficiency:

It is generally called the external quantum efficiency of the component, which is the product of the internal quantum efficiency of the component and the extraction efficiency of the component. The so-called internal quantum efficiency of a component is actually the electro-optical conversion efficiency of the component itself, which is mainly related to the characteristics of the component itself (such as the energy band, defect and impurity of the component material), and the composition and structure of the barrier crystal of the component. The extraction efficiency of the component refers to the number of photons generated inside the component that can actually be measured outside the component after the absorption, refraction and reflection of the component itself. Therefore, the factors related to the extraction efficiency include the absorption of the component material itself, the geometric structure of the component, the refractive index difference between 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 whole component, which is also the external quantum efficiency of the component.

Early component development focused on improving its internal quantum efficiency, by improving the barrier is the main method of crystal quality and change of crystal structure, that is not easy to convert electrical energy into heat energy, thereby indirectly improve the luminous efficiency of leds, which can obtain 70% internal quantum efficiency, the theory of but the internal quantum efficiency is almost close to the theoretical limit. Under such conditions, it is impossible to improve the total light quantity of the component by improving the internal quantum efficiency of the component, so improving the extraction efficiency of the component becomes an important research topic. At present, the main methods are: grain shape change -TIP structure, surface coarsening technology.

Electrical characteristics:

Current-controlled devices, load characteristics similar to PN junction UI curve, a small change in the positive guide voltage will cause a large change in the forward current (exponential level), reverse leakage current is very small, there is a reverse breakdown voltage. In actual use, it should be selected. The positive voltage of LED decreases with increasing temperature and has negative temperature coefficient. Leds consume power, part of which is converted to light energy, which is what we need. The rest is converted into heat energy, raising the temperature of the junction. The heat (power) emitted can be expressed as.

Optical properties:

LED provides monochromatic light with a large half-width. As the semiconductor energy gap decreases with the rise of temperature, the peak wavelength it emits increases with the rise of temperature, that is, the spectral redshift, and the temperature coefficient is +2~3A/.led linear L is approximately proportional to the forward current: K is the proportional coefficient. As the current increases, the luminance increases approximately. In addition, the luminance is also related to the ambient temperature. When the ambient temperature is high, the composite efficiency decreases and the luminance intensity decreases.

Thermal characteristics:

Low current, LED temperature rise is not obvious. If the ambient temperature is high, the main wavelength of LED will be red shifted, the brightness will decrease, and the uniformity and consistency of light will be worse. In particular, the temperature rise of dot matrix and large display screen has more significant influence on the reliability and stability of LED. So heat dissipation design is key.

Life:

LED for a long time to work light deterioration caused by aging, especially for high-power LED, light deterioration problem is more serious. When measuring the life of LED, it is far from enough to take the damage of the lamp as the end of the LIFE of LED. It is more meaningful to specify the life of LED by the percentage of light attenuation of LED, such as 35%.

LED fluorescent lamp features

LED fluorescent lamp with high quality, durable, energy saving as the main characteristics, projection Angle adjustment range is large, 15W brightness equivalent to ordinary 40W fluorescent lamp, high temperature resistance, moisture-proof waterproof, anti-leakage. Use voltage: 110V, 220V optional, the cover can be glass or PC material. The lamp cap is the same as the ordinary fluorescent lamp.

LED fluorescent lamp uses the newer LED light source technology, digital appearance design, power saving up to 70%, 12W LED solar light intensity is equivalent to 40W solar tube LED fluorescent lamp life is more than 10 times the ordinary lamp, almost free of maintenance, without frequent replacement of lamp, ballast, starter. Green semiconductor electric light source, soft light, pure spectrum, is conducive to the user’s vision protection and health. The cold light source of 6000K gives people a cool and refreshing feeling in the vision. The humanized illumination difference design helps to concentrate and improve efficiency.

1, strong applicability, adaptability and reliability have been improved in all kinds of harsh environment inside and outside

2, rich color: composed of three primary colors (red, green, blue) display unit box, so that the electronic screen to achieve rich color display, high saturation, high resolution, high frequency display of dynamic images

3, high brightness: the use of ultra-high brightness LED, the sun under the strong light is still clearly visible at a distance

4, good effect: using nonlinear correction technology, the image is clearer, the sense of hierarchy is stronger

5, high reliability: static scanning technology and modular design technology, higher reliability and stability

6, display mode diversification: support a variety of display modes.

Features of ordinary fluorescent lamp

Ordinary fluorescent lamp each ends have a filament, the tube is filled with trace argon and thin mercury vapor, fluorescent powder is besmeared on the inner wall of the tube, the gas between two filaments when conducting emits ultraviolet light, make fluorescent powder emits soft visible light.

Common fluorescent lamp work characteristic: a high voltage is needed when lamp tube begins to ignite, not big current is allowed to pass only when normal luminous, at this moment the voltage at both ends of lamp tube is under power supply voltage.

The inner wall of the glass tube is coated with a uniform layer of thin fluorescent powder. The tube is pumped with a vacuum of 10-3-10-4mm hg and filled with a small amount of inert gas and a small amount of liquid mercury. An inductive ballast is an iron-core inductive coil whose property is that when the current in the coil changes, it causes a change in the magnetic flux in the coil, resulting in an induced electromotive force, which is opposite to the direction of the current and thus obstructs the current change.

The glow generator acts as a switch in the circuit. It consists of a neon discharge tube in parallel with a capacitor whose function is to eliminate electromagnetic interference to the power supply and to form a vibration loop with the ballast to increase the amplitude of the starting pulse voltage. An electrode in the discharge tube is composed of a bimetallic sheet, which is heated by a neon bubble discharge. When the bimetallic sheet is opened and closed, the current of the inductance ballast will change and a high voltage pulse will be added to both ends of the lamp tube.

When common fluorescent lamp access circuit, electric fluorescent starter began to glow discharge between two electrodes, the bimetallic strip heat expansion and contact with the static contact extremely, so the power supply, ballast, filament and electric fluorescent starter constitute a closed loop, current filament preheating, 1-3 seconds when the heating time, electric fluorescent starter of glow discharge between two electrodes, With the bimetallic strip cooling and static contact is extremely disconnected, when two electrodes disconnect instantly, the current in the circuit suddenly disappeared, so ballast produces a high voltage pulse, and it has to do with power superposition, on both ends of the tube and, make the inert gas ionization inside the tube caused by arc discharge, in the process of normal light, ballast self-induction is still stable circuit in current role.

By comparing the attribute characteristics of LED fluorescent lamps with those of ordinary fluorescent lamps, it is concluded that:

LED fluorescent lamps and ordinary fluorescent lamps have the following advantages:

Energy saving, long life, good applicability, because of the small size of a single LED, can be made into any shape, short response time, environmental protection, no harmful metal, easy recycling of waste, brilliant color, pure luminous color, narrow spectrum range, and can be mixed red, green and blue three colors into colorful or white light.

LED fluorescent lamp and ordinary fluorescent lamp comparison led tape lighting has the following shortcomings: the price is expensive, can generally do light efficiency and theoretical light efficiency there is a big gap, can do life and theoretical life there is a big gap,. There is still a certain amount of calorific value, and light decline can be greatly reduced.

Advantages:

1, environmental protection lamps and lanterns, protect the earth

Traditional fluorescent lamps contain a lot of mercury vapor, which can evaporate into the atmosphere if broken. But LED fluorescent lamps do not use mercury at all, and LED products do not contain lead, which protects the environment. LED fluorescent lamps are recognized as the green lighting of the 21st century.

2, efficient conversion, reduce heat

Traditional lamps produce a lot of heat, but LED lamps convert all the electricity into light energy, and do not cause energy waste. And the documents, clothing will not produce fading phenomenon.

3, quiet and comfortable, no noise

LED lamps do not produce noise and are the best choice for the use of precision electronic instruments. Perfect for libraries, offices, things like that.

4, soft light, protect the eyes

Conventional fluorescent lamps run on alternating current, so they produce 100-120 strobograms per second. LED lamps convert ALTERNATING current to direct current, no flicker phenomenon, protect eyes.

5, no uv, no mosquitoes

LED lamps do not produce ultraviolet light, so there are no mosquitoes around the light source like traditional lamps. The interior will become more clean and tidy.

6, the voltage can be adjusted 80V-245V

Conventional fluorescent lamps are turned on by a high voltage released by a rectifier and cannot be turned on when the voltage drops. LED lamps, on the other hand, can light up within a range of voltages and adjust their brightness.

7, save energy, longer life

LED fluorescent lamps consume less than one third of the power of traditional fluorescent lamps, and their life span is 10 times that of traditional fluorescent lamps. They can be used for a long time without replacement, reducing labor costs. More suitable for difficult to change the situation.

Strong and reliable, long time use.

The LED lamp body itself is made of epoxy resin rather than traditional glass, which is stronger and stronger. Even if it is hit on the floor, the LED will not be easily damaged, so it can be used safely.

9, compared with ordinary fluorescent lamp, LED fluorescent lamp without ballast, without starter, no stroboscope.

10, maintenance-free, frequent switch will not cause any damage.

11, safe and stable quality can withstand 4kV high voltage low heat dissipation can work at low temperature -30℃ high temperature 55℃.

12. There will be no impact on the surrounding environment. There is no ULTRAVIOLET and infrared light, no harmful materials such as mercury to protect the eyes, and no noise.

13, good vibration resistance, easy to transport.

Material composition and appearance

1, LED fluorescent lamp by a number of ultra-bright low-power LED, high transmittance OF PC cover, heat dissipation aluminum parts and power supply.

2, LED fluorescent lamp light source has straw hat head and patch lamp bead two models.

The commonly used patch beads have 3528, 5050, 1W power and so on

3, LED fluorescent lamp shell has two kinds:

1) Transparent PC shell, high light transmittance, you can see the lamp beads inside;

2) Translucent frosted shell, soft light.

4, LED fluorescent lamp built-in power supply, working voltage is wide voltage, from 85V to 265V can be used.

5, LED fluorescent lamp can be made into red, yellow, blue, green, white, warm white color.

Basic specifications

T5: current LEDT5 lamp tube specifications

T8: Current T8 specifications

Scope of application:

Office buildings, factories, shopping malls, schools, home and other indoor lighting.

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