LED fluorescent tube purchase guide serialized-Part One
In the "LED Fluorescent Tube Selection Guide Serial", it mainly introduces the length, power, and diameter of the LED fluorescent tube purchase. In this "LED Fluorescent Tube Selection Guide-Appearance Part 2", I mainly want to talk to you Talk about the other aspects of the appearance of the LED: the profile, structure, and the advantages and disadvantages of the internal and external LED power supply. When purchasing LED fluorescent tubes, you can also consider LED profiles and tube structure, and then purchase LED fluorescent tubes according to your personal needs.
1. Profiles of LED fluorescent tubes:
1. All plastic LED fluorescent lamp:
In the early development of LED lights, all-plastic tubes were also used more, because before LED fluorescent lights, LED landscape lights such as LED guardrail tubes were mainly all-plastic tubes; It can be done easily if the plastic tube has passed the safety regulations.
All plastic pipes are divided into two types: acrylic and PC. Acrylic pipes are relatively poor. The main problem is low transparency (40~55%), which is prone to discoloration and deformation. So later, we introduced pipes made of PC materials. PC LED fluorescent tubes have a transparent light transmittance of up to 97%. Diffusion materials depend on the source and formula of the material, so that the lamp point is not displayed. And high light transmittance is excellent. The light transmittance depends on the material, ranging from 70% to 88%. In terms of purchase, of course, it is better to choose more than 85%.
But the biggest problem with all-plastic LED fluorescent tubes is heat dissipation. Because PC or acrylic are poor thermal conductors, the first step of heat dissipation: conduction is a problem. Since the heat of the LED lamp beads cannot be dissipated, the LED A large amount of heat from the lamp beads accumulates in the lamp tube, which causes the junction temperature of the LED lamp bead to be too high, and the light decay is very serious. In addition, many of them use straw hat lamp beads. The life of the lamp beads is only About 5,000 hours, so many LED fluorescent tubes that do this are broken in less than 2,000 hours, or have only 30-50% brightness. Therefore, it is not recommended to buy this type of LED fluorescent tube. LED fluorescent tube purchase guide
2. Aluminum + partly transparent plastic tube (mainly PC tube, few people use acrylic):
Most of the LED fluorescent lamps on the market now use this structure, because the LED lamp beads basically emit light at 120º, so it is also a feasible method to use light-transmitting materials only on the light-transmitting side; and On the opaque side, aluminum is used to dissipate heat from the LED lamp beads. The light decay of this kind of LED fluorescent tube is usually much smaller (it depends on whether the LED lamp bead is made of SMD (SMD) or straw hat lamp; whether the lamp bead is attached with aluminum substrate or PCB board, etc.). Will analyze one by one).
Aluminum + PC mainly has the following situations:
One is 1/3 luminous surface, 2/3 aluminum or 1/2 luminous, 1/2 aluminum. This kind of LED fluorescent lamp has a problem. The light-emitting surface is too small, which causes the LED to emit light to be concentrated on the front. The latest Japanese safety regulations have made requirements for this aspect "within the range of 120 degrees." It is important to pay attention to the luminous flux not exceeding 70%. Its characteristic is that the light can fully reach the part exceeding 120 degrees. The luminaire has the use of a reflector to obtain the desired light orientation. Such luminaires are very It is difficult to use a light tube that is only bright directly below the tube. In addition, if the light does not reach the surroundings of the tube, there will be a situation of "discomfort because the wall is dark but bright directly below." In order to prevent this, it is necessary to To meet this condition, you can visit: "Specific requirements and parameter analysis of Japanese LED fluorescent lamp specifications" for details. This is mainly because the power supply is not well done and it is too big. So there is no way to put the power supply inside the aluminum tube.
One is a large-luminous-surface LED fluorescent lamp, that is, more than half of the luminous surface, like a T8-LED fluorescent tube made of green fluorescent light, the luminous surface is as high as 2/3. The light-emitting angle is as high as 240º, and most of the wall can be illuminated without shadows. The thickness of the power supply of this LED fluorescent lamp is only 7mm high.
2. The structure of LED fluorescent tube:
Since it is a combination of aluminum + PC, the joint is also one of the ways we look at a company's attitude towards products.
It mainly depends on whether there are steps in the joint part, whether it can be smooth and excessive, whether the tube body of the lamp is a perfect circle, even if it is not a perfect circle, how much error is there? Is it within 0.5mm (50 wires)? Because 50 wires can be said to be the normal tolerance of a normal plastic mold. After 50 silks, the reason must be understood. There are many fake T8 tubes on the market now. The main problem is that the pipe diameter does not match the T8 (28~30), and the pipe body is not round.
The other is whether the structure of PC and aluminum is strong. This test is very simple. Take a 1.2m LED fluorescent lamp, hold the two ends with both hands separately, keep your hands clockwise and one hand counterclockwise, twist it hard, and it will not deform at all. Or the ones with little deformation are good. Don’t believe it, some twists are just like twists.
In summary: LED fluorescent tube purchase guide
When purchasing LED fluorescent tubes, it is best not to use all-plastic tubes in terms of material, mainly for the consideration of heat dissipation and light decay; it is best to use a combination of PC+aluminum, and find a solid structure on this basis.
And the best light-emitting surface is to find LED tube with large light-emitting surface. Don’t look at this simple. Up to now, T8-LED fluorescent tube has built-in power supply (don’t put both ends), and it can achieve 240º LED tube. The whole market is exclusive. You are also welcome to come to the Green Fluorescent LED Showroom for technical guidance.
