How to choose cheap and high quality LED panel light / panel light

First, the light guide plate

Now there are many kinds of light guide plates, there are silk screens, there are laser dots, there are V-grooves, and there are high-molecular homogenizing plates. There are also many thicknesses, 3mm, 4mm, 6mm, 8mm, different thicknesses, different types. There is a lot of difference in the price of the plates, but the core of the flat lamp is on the light guide plate. What kind of light guide plate is good? Personally, the light guide plate is mainly a light guiding function, as long as the light guiding efficiency is high, the uniform illumination is high, and the phenomenon of yellowing and blistering does not occur for a long time of lighting, and the others are floating clouds. At present, the light-guided light guide plate has the highest light guiding efficiency and the best effect, but the price is also the most expensive in these categories! - The price difference varies from 5-15 yuan. The thicker the thickness of the sheet, the higher the illuminance. Now there are more 4mm light guide plates on the market, because the price of 4mm and 6mm plates is about 20-30 yuan.

Therefore, on the light guide plate, you must know the type of flat light guide plate and the thickness of the plate material manufacturer and thickness. The light guide plate is relatively high in this piece of water, and the price of the poor light guide plate is about 30 yuan!

Second, the drive power

This is the main component that directly affects the energy efficiency and life of the panel light. The front panel lamps are constant voltage with constant current to drive the panel light. This method has low efficiency, low power factor and high cost. Now it is gradually eliminated. Personally, if you see the tablet driven by this method. The lamp is recommended to be changed to a direct constant current flat panel light! (Individuals are engaged in structure, cost analysis of this piece of power

May not be unique enough, you can engage in power generation heroes can shoot bricks! But don't shoot your face)

It is well known that Mingwei power supply is the most cattle, and the price is also surprisingly high, but its stability is relatively good. For our users, there are the following points to consider when looking at the power supply:

1, the efficiency of the power supply (this is directly affecting the energy efficiency of the luminaire, but also to assess whether a power supply is well designed)

2, whether with PF value (the price of power with PF and no PF value is also very different)

3, power transformer temperature (this directly affects the life of the power supply, generally with aluminum shell power supply glue, heat is better, stability is also higher, but the price is quite different)

4, Is there any certification (power supply some electrical parameters we do not understand, there is no instrument testing, mainly to see if there is any certification, so you can understand whether a power supply can pass the safety performance, CE certification is a must, there is UL certification It’s relatively expensive, but all aspects of quality are better.)

The price of the power supply is also uneven, and the price difference is also very far. The power supply with a very low price like Zhongshan is a solution for people to copy. Then, the domestic electronic components are used, or the recycled materials are used. Labeled, what certification marks are there, and then the actual certificate is not one, with the ordinary power supply price difference of 20-40 yuan, quality is not guaranteed after sale.

Third, LED lights

Nowadays, the competition in the lamp market has entered a feverish trend, and the price war continues. Domestic packaging companies are trying to reduce costs. The materials are getting worse and worse. I still recommend using imported lamp beads to ensure that the domestic market is too chaotic. The price of the beads ranges from a few points to 1 hair 2 hairs. The price of the lamp beads is too high, and the test time period is relatively long. If it is pitted, the loss will be irreparable, and the number of LEDs used in the panel lamps is relatively large, and the price difference is different. 1 point, 2 points, the overall cost price is also very different, as far as 5630, the domestic general price is about 2-3 hair, and the price of a Samsung lamp is about 5 hair, the price of a flat light is different. Nearly 18 yuan

Fourth, the diffusion plate

The main materials are PC, PMMA, PS, PP composite materials. The diffuser plate mainly plays the role of shielding the debris and the light guide plate in the use of the flat light, so that the light from the light guide plate is more uniform. The main materials are: PC, PMMA, PS, PP, the most used at this stage is the PS material, as to why PS material is the favorite of the major flat panel manufacturers!

PC -

Polycarbonate

Advantages: 1. High strength and elastic modulus, high impact strength, wide temperature range; 2. High transparency and free dyeability; 3. High HDT (heat distortion temperature means that the plastic starts under a certain pressure. Deformation temperature.); 4, good fatigue resistance; 5, good weather resistance (weather resistance refers to plastic products due to exposure to sunlight, temperature changes, wind and rain and other external conditions, and the appearance of fading, discoloration , a series of aging phenomena such as cracking, chalking and strength reduction. Among them, ultraviolet radiation is the key factor to promote plastic aging.); 6, odorless and odorless, harmless to the human body, in line with health and safety; 7, low shrinkage rate, size Good stability.

PMMA - commonly known as acrylic

(The chemical name is too long to remember, interested friends can go to Baidu) 1. Acrylic sheet has excellent weather resistance, high surface gloss, and good high temperature performance. 2. Acrylic sheet has good printability and sprayability, and can be used to impart ideal surface decoration effect to acrylic products by proper printing and spraying process. 3. Flame resistance: not self-igniting and self-extinguishing. 4. Acrylic is brittle and easy to break. Acrylic application to flat panel lamps has the following advantages: 1. Low cost, easy processing and acrylic, and cheap materials, so in the early production of flat lamps, acrylic is also more used 2. Screen printing effect Excellent, flat panel lights are generally more monotonous, and now many traders like to screen their logos and electrical parameters on the flatbed lamps, so if customers need a large area of ​​silk screen, the first choice is of course acrylic. It is about the transmittance of acrylic, which is about 90%. The ultra-high transmittance also brings trouble to it. It is well known that flat-panel lamps are produced by backlighting, and there is also a requirement for planar debris. Because of the strong light transmission, it is difficult for the diffusion powder to cover the debris, and there are often bright spots. And acrylic and PC have double-sided protective film, static electricity is large, easy to absorb dust, production operations are difficult.

PS -

Polystyrene

PS has very good chemical stability and thermal stability

, optical transmission characteristics, strong refraction, strong electrical insulation properties and a very small tendency to absorb moisture, can be used in a humid environment, with high radiation resistance. It is resistant to water and diluted mineral acids. At the same time, it has brittleness, low impact strength and poor weather resistance. It is prone to yellowing and brittleness when exposed to the outdoors for a long time. Its heat resistance is also poor, the deformation temperature is 70-90°, it can only be used in an environment below 70°, its low temperature resistance is not good, and the embrittlement temperature is -30.