1. LED panel light introduction
With the development of the LED lighting industry, the LED panel light derived from the LED backlight has a unique design. The light passes through the light guide plate with high light transmittance to form a uniform plane luminous effect, with good illumination uniformity, soft light, Comfortable and bright, it can effectively relieve eye fatigue. LED panel lights can also prevent radiation and will not irritate the skin of pregnant women, the elderly, and children. They are loved by many people and are a new trend in modern and fashionable indoor lighting. LED panel lights have many names in the market, such as LED panel lights, LED panel lights, LED ceiling lights, and LED ceiling lights.
1.1 Features of Panel Light
1. Flexible design of LED panel light
LED is a point-shaped luminous body. The designer can design various light sources with different shapes and different particles according to customer requirements through the flexible combination of points, lines, and surfaces. The design is very flexible.
2. The LED panel light has high illumination
The LED panel light adopts a uniformly luminous reflective panel and a sealed design, with a high-efficiency light guide plate, and is made of aluminum alloy materials. The luminous effect is uniform and the illuminance is higher.
3. LED panel light has less heat
The LED panel light has a light and thin appearance, complete heat dissipation function, low power and less heat.
4. Long life of LED panel lights
The theoretical life of LED is as long as 100,000 hours. If calculated by 8 hours a day, its theoretical life span is more than 27 years. The theoretical life of CPL lamp cup even exceeds 100,000 hours.
5. Variety of LED panel lights
LED panel lights can adjust the light color according to different needs and environmental changes, not only without radiation and glare, but also can protect eyesight, and the light color is more gentle.
6. The LED panel light has strong vibration resistance
In the LED panel light, the LED light source is a high-hardness resin luminous body instead of tungsten glass, etc., which is not easily damaged, so its vibration resistance is relatively high, and its environmental temperature adaptability is strong.
7. Strong control ability of LED panel lights
The LED panel light can be controlled by various dynamic programs through an external controller, and can adjust the color temperature and brightness.
8. LED panel lights have low power consumption
At the same time, LED panel lighting technology is still a green lighting technology. The products do not contain mercury, have less waste, and there is almost no pollution in the manufacturing process. Semiconductor lighting is recyclable and recyclable, which is important for the sustainable development of the economy and society. effect.
2. Introduction to LED panel light structure
2.1 Panel light aluminum frame
The panel light aluminum frame is the main channel for LED heat dissipation. The appearance is simple and generous. Using T6063, the extrusion mold, the mold opening cost is low, and the processing cost is low; the stretched aluminum frame has a low IP rating, good surface texture, and overall beautiful appearance.
2.2 Aluminium frame link method
Detachable link corner
Use a right-angle fitting to link the two aluminum profiles, and lock the corner screws to link them.
Advantages: free to disassemble and assemble
Disadvantages: Need to lock screws, labor-intensive, slow assembly, and need to reserve corner slots.
Use an electric welder to directly weld the two aluminum profiles together.
Advantages: The production speed is relatively high, no corner grooves are required.
Disadvantages: Need to configure a professional welding machine, and higher requirements for production personnel.
The light of the light guide plate is uniformly led out, and it can also play the role of blurring the dots. Diffusion plates generally use acrylic 2.0 sheets or PC materials, almost PS materials, acrylic has a lower cost and a slightly higher light transmittance than PC, acrylic is brittle and has weak anti-aging properties, and PC is slightly expensive, but it has anti-aging properties Strong. After the diffuser is installed, the dots cannot be seen, and the light transmittance should be around 90%. Acrylic transmittance is 92%, PC is 92%, and PS is about 90%.
2.4 Light guide plate
The light guide plate uses optical grade acrylic sheet, and then uses high-tech materials with extremely high reflectivity and non-light absorption, and UV screen printing technology is used to print the light guide dots on the bottom surface of the optical grade acrylic sheet. The optical grade acrylic sheet is used to absorb the light emitted from the lamp and stays on the surface of the optical grade acrylic sheet. When the light hits each light guide point, the reflected light will spread to all angles, and then destroy the reflection condition and exit from the front of the light guide plate. The light guide plate can emit light evenly through a variety of dense and different light guide points. The purpose of the reflective sheet is to reflect the light exposed on the bottom surface back into the light guide plate to improve the efficiency of light use.
Flat plate: The light guide plate is rectangular when viewed from the light incident.
Wedge-shaped plate: also known as the inclined plate, viewed from the light incident, one side is thick and the other is thin into a wedge (triangular) shape.
Printing: After the light guide plate finishes the shape processing, the dots are printed on the reflective surface by printing, which is divided into IR and UV.
Non-printing type: The dots are directly formed on the reflective surface when the light guide plate is formed. It is divided into chemical etching (Etching), precision mechanical characterization (V-cut), photolithography (Stamper), and internal diffusion.
Follow the light
Side-light type: Place the luminous body (tube or LED) on the side of the light guide plate.
Direct type: Place the luminous body (tube or LED) under the light guide plate.
Injection molding: Use an injection molding machine to inject optical grade PMMA particles into a mold at high temperature and high pressure to cool and shape.
Cutting and forming: the optical grade PMMA original board is cut to complete the finished product
to sum up
The light guide plate refracts the side LED light through the dots so that the light is uniformly exported from the front. The light guide plate is the key point of the quality control of the LED panel light. If the design of the dots is not good, the overall light effect is very poor, the light is uneven, there will be dark on both sides of the light in the middle, or there is a bright light band at the entrance of the light, or a partial dark area is visible, or the brightness of different angles is inconsistent. To improve the light efficiency of the light guide plate mainly depends on the design of the dots, followed by the quality of the plate.
2.5 reflective paper/reflective paper
Reflect the remaining light on the back of the light guide plate to improve light efficiency.
There are two types of backplanes: one is the bendable backplane and the non-bendable backplane. Its main function is to seal the LED panel light. Generally, 1060 aluminum, iron plate, aluminum-plastic plate are used, which can also play a role in heat dissipation.
2.7 Foam pad cotton
Commonly used material pad cotton: PVC, EVA, pearl cotton, sponge pad and so on. The main function is to make the back plate, light guide plate, diffuser plate and aluminum frame better fit and press tightly.
2.8 Guard coil
Rubber protective coil shape: 1. Through hole (most commonly used) 2. Oval type 3. With diaphragm in the middle
Purpose: The product is stuck on a metal plate with wires in the middle. The purpose is to protect the wires from being cut by the metal plate.
2.9 Fastening parts
Fastening piece: deform the aluminum back plate to achieve the purpose of fixing the back plate.
Advantages: 1. The assembly speed is relatively fast. 2. It can ensure that the back of the panel light is flat.
Disadvantages: 1. The disassembly is relatively slow. 2. When assembling, it is necessary to press the back plate strongly. 3. The back plate needs to be bent. 4. Relatively high requirements for the size of the backplane.
Screw: The pressure generated by the screw and the thread of the aluminum frame has achieved the purpose of fixing the back plate.
Advantages: 1. Convenient disassembly (unfavorable for multiple disassembly and assembly), and the shape of the back plate is not restricted.
Disadvantages: 1. The back plate needs to reserve screw holes. 2. There will be screw heads on the back of the panel light. 3. The assembly speed is relatively slow.