How to choose LED tube light?

<p>Nowadays, there are countless companies producing LED tube lights on the market, and the quality and performance of products vary greatly. Many people do not know how to distinguish the quality and performance of <a href="https://www.leimove.com/led-light-source" rel="noopener noreferrer" target="_blank">LED tube light</a>&nbsp;produced by various enterprises during the process of purchasing products. </p><p><br></p><p>Today, we will tell you how to choose some LED off lights. LED tube lights can be purchased from the following aspects: profile, power supply, chip.</p><p><br></p><p>1. Profile and structure.</p><p>There are basically two types of profiles on the market: all plastic, half plastic and half aluminum tubes.</p><p><br></p><p>1. All plastic tubes: The early LED tube lights used all plastic tubes. Because the main use of non-isolated power supply, in order to avoid electric shock problems, I hope to use all plastic tubes. Inside is the φ5 straw hat tube LED. The biggest problem of this fluorescent lamp is the heat dissipation problem. Because all the heat is sealed in the tube, it cannot be dissipated at all, and the light decay is very serious. In addition, the straw hat tube has a very short life, and it is broken in less than 2000 hours.</p><p><br></p><p>2. Semi-plastic semi-aluminum tube: The LED tube lights on the market are basically half PC and half aluminum alloy. Plastic is used in the half that needs to transmit light, and half is needed for heat dissipation that does not require light. Using aluminum alloy. The power supply is of course placed in an aluminum tube. In this way, the heat generated by the LED plus the heat generated by the power supply is quite large, because the power of this lamp is usually around 20W. If the power is bigger, half of the aluminum tube can't solve its heat dissipation problem. Therefore, another aluminum tube structure for heat dissipation is proposed: a fan-shaped aluminum tube. The fan-shaped aluminum tube uses a fan-shaped heat dissipation structure, which greatly increases the area of ​​the radiator. It puts the power supply outside the tube, so that half of the aluminum shell can be completely made into a radiator. Compared with the semi-circular aluminum tube, its heat dissipation area has increased by at least 3 times. In addition, the power supply is not placed in the tube, and the heat can be reduced, which greatly extends the life of the LED. (The picture cannot be put in, please forgive me)</p><p><br></p><p>Second, the power supply</p><p>The power supply of LED tube light&nbsp;is divided into built-in type and external type. The so-called built-in means that the power supply can be placed inside the lamp. The biggest advantage of this built-in type is that it can be made to directly replace the existing fluorescent tube without any circuit changes. Therefore, the built-in shape is made into a long strip, so as to be inserted into the semi-circular lamp tube.</p><p><br></p><p>1. Non-isolated constant current power supply: Non-isolated means that there is a direct connection between the load end and the input end, so there is a risk of electric shock when touching the load. The advantages of non-isolated constant current sources are simple circuit design and low manufacturing cost. The disadvantage is that the high voltage of the AC power supply will be introduced to the load end, thereby causing the risk of electric shock.</p><p><br></p><p>2. Isolated constant current power supply: Isolated refers to the isolation transformer isolation at the input and output. But all can isolate the input and output. The advantage of isolating constant current source is that the circuit design is complicated and the danger of electric shock can be avoided. The disadvantage is that the efficiency of the power supply will be reduced, the manufacturing cost is high, and the volume is relatively large. It is OK to put the T10 lamp tube, but the T8 lamp tube is more nervous.</p><p><br></p><p>3. Centralized external power supply: In order to get the highest performance, it is best to use a centralized external power supply. Because the main places currently promoting LED tube lights are government agencies, offices, shopping malls, schools, underground parking garages, subways and other places, often more than one fluorescent lamp is used in one room, which may be more than 10. At this time, you should use a centralized external power supply. The so-called centralized refers to the use of a high-power AC/DC switching power supply, unified power supply, and each fluorescent lamp uses a separate DC/DC constant current module. This can get the highest efficiency and the largest power factor. The advantages of centralized power supply are obvious. Moreover, it is an isolated power supply, this structure is also easy to implement various dimming solutions,</p><p><br></p><p>Third, the chip</p><p>Currently used in fluorescent lamps are 3528, 3020, 3014 and other specifications. These specifications are mainly due to their different sizes and chip heat dissipation methods. Chips of the same brand have different packaging manufacturers and different quality.</p><p><br></p><p>4. Other</p><p>1. Power protection cover: The built-in power supply is placed in the aluminum alloy radiator, which must be insulated from it, if not leakage will occur. External power supply does not have this phenomenon. There are currently three ways on the market.</p><p>1) Insulation sheet, wrap the power supply around with a piece of insulation paper, and then plug it into the lead alloy radiator together. Disadvantages of this method: During the operation of plugging the power supply into the aluminum alloy radiator, the insulation paper is easily broken by the corners of the aluminum alloy; because there is nothing fixed at both ends of the power supply, the power supply is easy to move in the aluminum alloy tube .</p><p>2) Heat-shrinkable tube, which is a kind of PC material that shrinks when heated , So as to achieve the purpose of insulation. Disadvantages: The heat shrink tube is tightly integrated with the electrical components on the power supply, and the heat energy emitted by the power supply cannot be dissipated, thereby shortening the service life of the power supply.</p><p>3) Insulation box, this is an insulation box customized according to the size of the power supply. It has heat dissipation holes and fixing parts, which is the best way to achieve the best insulation effect. (The picture cannot be put in, please forgive me)</p><p><br></p><p>2. Fixed end: There are many joints on the market at present, there are aluminum skins, there are PC materials, aluminum skins plus PC materials, according to the fixed way, there are glue fixed at both ends of the lamp, and screws are fixed to the lamp. Two tubes. In terms of safety and environmental protection, the method of fixing with screws is adopted by the majority of consumers. (The picture cannot be put in, please forgive me)</p><p><br></p><p>3. Transmittance of PC masks: At present, the transmittance of transparent masks in the market can reach 88-95%, and the transmittance of mist masks is 70-86%. If the luminous flux of a tube without a mask is 2000 lm, and now add a transparent mask with a transmittance of only 88%, then its actual luminous flux is only 1760 lm. If you add a transparent mask with a light transmittance of 95%, then its actual luminous flux is 1900lm, which is also a transparent mask, so why is there such a big difference between the two? The answer lies in the mask material. At present, the materials of PC masks on the market include ordinary PC materials and optical grade PC materials. The difference in light transmittance is quite large due to different manufacturers.</p><p><br></p><p>4. Substrate: At present, the LED chip is pasted on the PCB or aluminum-based electronic circuit board in a certain arrangement, and then fixed on the aluminum alloy radiator. The thermal conductivity of PCB is 20w/mk, and the thermal conductivity of aluminum alloy is 200w/mk. The greater the thermal conductivity, the better the heat and thermal conductivity.</p><p><br></p><p>5.&nbsp;Lifespan: The lifespan of lamps depends on the reasonable combination of chip, power supply, heat dissipation, etc., but these are still very difficult for non-professionals who don’t know how to make choices. In the final analysis, except for the most basic Unexpectedly, there is also a most basic reference is the light effect, the higher the light effect, to a certain extent, this lamp is done better! Generally strong manufacturers have this test equipment.</p>