How to choose LED fluorescent tube lamp correctly?
There are many companies that produce LED fluorescent tube lamps in the market, and the quality and performance are also very different. This makes incompetent non-professionals who do not know how to distinguish the quality and performance of LED fluorescent tube lamps during the purchasing process, and do not know what to do when purchasing. They may spend a high price and fail to buy the ideal product they want. How to choose LED tube light?
Profile and structure
There are basically three types of profiles on the market: all plastic, semi-plastic and semi-aluminum tubes, and glass tubes.
1. All-plastic tube: LED fluorescent tube lamp uses all-plastic tube. In order to avoid the problem of electric shock, it is more desirable to use all-plastic tube. The biggest problem of this kind of 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.
2. Semi-plastic and half aluminum tube: The LED fluorescent tube lamps sold on the market are basically half PC and half aluminum alloy. Plastic is used for the half that needs light transmission, and the half that does not need light transmission but needs heat dissipation. Aluminum alloy. The power supply is placed inside the aluminum tube. The biggest feature is good heat dissipation and long life.
3. Glass tube: The biggest advantage is that the tube is cheap, but the fatal problem is heat dissipation. Glass cannot dissipate heat, and its life span is the same as that of plastic tubes, which is relatively short. The power produced is also relatively small.
Driver power supply
The power supply of LED fluorescent tube lamp is divided into two kinds of built-in type and external type. The so-called built-in type means that the power supply can be placed inside the tube. 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 to fit into the semi-circular lamp tube.
1. Non-isolated constant current power supply: refers to the direct connection between the load end and the input end, so there is a risk of electric shock if the load is touched. The advantage is that the circuit design is simple and the manufacturing cost is not high. The disadvantage is that the high voltage of the AC power supply will be introduced to the load end, causing the risk of electric shock.
2. Isolated constant current power supply: refers to the isolation transformer at the input and output ends. But it can isolate the input and output. The advantage is that the circuit design is complicated and the risk of electric shock can be avoided. The disadvantage is that the efficiency of the power supply will be reduced, the cost is high, and the volume is large.
3. External power supply: In order to get the highest performance, it is best to use a centralized external power supply. Places where LED fluorescent tube lamps are used intensively, such as government agencies, offices, shopping malls, schools, underground parking garages, subways, etc., often use more than one fluorescent lamp, possibly more than dozens. At this time, it is better to use a centralized external power supply. Using a high-power AC/DC switching power supply unity power supply, you can get the highest efficiency.
LED chip
In general, the quality of first-tier brands such as CREE, Osram, HP, and Nichia Chemicals must be better than second-tier or Taiwanese brands. Expensive. The fluorescent lamps are 3528, 3020, 3014, 2835 and other specifications. These specifications are mainly due to their different sizes and chip heat dissipation methods. Chips of the same brand are packaged by different manufacturers and have different quality.
Other parts
1. Power supply protective cover: The built-in power supply is placed in the aluminum alloy radiator, so there must be a way to insulate it, otherwise leakage will occur. Insulation box, this is a kind of 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 insulate at present.
2. Fixed ends: There are many joint methods on the market at present, there are aluminum skin, PC material, and aluminum skin plus PC material. According to the fixing method, there are glue fixed on both ends of the lamp tube, and screws can be used to fix the lamp tube. Two tubes. In terms of safety and environmental protection, the method of fixing with screws is adopted by the majority of consumers.
3. The light transmittance of the PC mask: the light transmittance of the transparent mask can reach 88-95%, and the light transmittance of the fog mask is 70-86%. If the luminous flux of a lamp tube without a mask is 2000lm, and a transparent mask with a light transmittance of only 88% is added to it, its actual luminous flux is only 1760lm. If you add a transparent mask with a light transmittance of 95% to it, the actual luminous flux will be 1900lm. The materials of the PC mask include ordinary PC materials and optical grade PC materials.
4. Substrate: Mount the LED chip surface on the PCB or aluminum substrate, and then fix it on the aluminum alloy radiator. The thermal conductivity of PCB is 20w/mk, and the thermal conductivity of aluminum alloy is 200w/mk. Aluminum substrates are mostly used.
5. Lifespan: It mainly depends on the reasonable combination of chips, power supply, heat dissipation, etc., but it is still difficult for non-professionals who do not know how to make a choice. In addition to the most basic materials, there is a most The basic reference is the light effect. The higher the light effect, the better the light will do!
