Disadvantages and purchase of LED energy-saving lamps for lifting lighting

Time：2021-03-02 View：

LED disadvantages
1. LED energy-saving lamps need corresponding radiators. Under the condition that the heat generation of LED chips has not been greatly improved, further development is needed in the structure of radiators and the application of heat pipe technology.
2. LED energy-saving lamps, the price is too high, the price of LED monomer, aluminum radiator, high efficiency constant current power supply, high light transmittance soft lampshade, four costs collectively push up the LED cost.
3. The power marked by most LED energy-saving lamps is the sum of the power of the LED chip itself, not the input power of the power supply. Some bad manufacturers are driven by inferior rectifier circuits, which will cause the actual energy consumption of LED bulbs to exceed the level of energy-saving lamps and even close incandescent lamp. Some brands of 3W energy-saving lamps have been found in the market, and the input current of 220V power supply is as high as 90mA(19.8W).

Purchase

 

Lamp beads
1. The LED brightness (MCD) is different and the price is different. The LED used for LED lamp shall conform to the laser grade class I standard.
2. Antistatic ability. LED with strong antistatic ability has a long service life, so the price is high. Generally, LED with antistatic more than 700V can be used for LED lighting.
3. LED with the same wavelength has the same color. If the color is the same, the price is high. It is difficult for manufacturers without LED spectrophotometer to produce products with pure colors.
4. Leakage current LED is luminophor of unidirectional conduction. If there is inverse current, it is called leakage. LED with large leakage current has short service life and low price.
5. Luminous angle the luminous angle of LED with different uses is different. Special luminous angle, high price. Such as full diffusion angle, the price is relatively high.
6. Different life span. The key to quality is life, which is determined by light decay. Small light decay and long service life; Long service life and high price.
7. Luminophor of chip LED is chip, and the price varies greatly with different chips. Chips in Japan and the United States are more expensive. Generally, the prices of chips in Taiwan and China are lower than those in Japan and the United States.
8. The size of the wafer is expressed by the length of the side, and the quality of the large chip LED is better than that of the small chip. The price is proportional to the chip size.
9. Colloid ordinary LED colloid is generally epoxy resin, and LED with UV resistance and fire-proofing agent is more expensive. High-quality outdoor LED lighting should be UV resistant and fireproof. Each product will have different designs, and different designs are suitable for different purposes. The reliability design of LED lighting includes: electrical safety, fire safety, applicable environment safety, mechanical safety, health and Safety, safe use time and other factors. From the perspective of electrical safety, it should conform to relevant international and national standards.

 

Driving power supply
1. High reliability: especially like the driving power of LED street lamp, it is installed at high altitude, which makes maintenance inconvenient and costs a lot.
2. High efficiency LED is an energy-saving product, and the efficiency of driving power supply is higher. It is particularly important for the structure where the power supply is installed in the lamp. Because the luminous efficiency of LED decreases with the increase of LED temperature, the heat dissipation of LED is very important. The efficiency of the power supply is high, its power consumption is small, and the heat generated in the lamp is small, which reduces the temperature rise of the lamp. It is beneficial to delay the light decay of LED.
3. High power factor: Power factor is the load requirement of power grid. Generally, there is no mandatory indicator for electrical appliances below 70 watts. Although the low power factor of a single electrical appliance with small power has little influence on the power grid, when everyone lights up at night, the load of the same kind is too concentrated, which will cause serious pollution to the power grid. For the 30-40 watt LED driving power supply, it is said that in the near future, there may be certain index requirements for power factors.
4. Driving mode: There are two types of traffic: One is that one steady voltage source supplies multiple constant flow source, and each constant flow source supplies power to each LED separately. In this way, the combination is flexible, one LED fault, does not affect the work of other LED, but the cost will be slightly higher. The other is direct constant current power supply, LED series or parallel operation. Its advantage is that the cost is a little lower, but the flexibility is poor. It also needs to solve the problem that one LED fault does not affect the operation of other LED. These two forms coexist for a period of time. Multi-channel stable output current power supply mode will be better in terms of cost and performance. Maybe it is the mainstream direction in the future.
5. Surge protection: LED's ability to resist surge is relatively poor, especially its ability to resist backward voltage. It is also important to strengthen protection in this regard. Some LED lights are installed outdoors, such as LED street lights. Due to the startup and rejection of the grid load and the induction of lightning strike, various surges will be invaded from the grid system, and some surges will lead to LED damage. Therefore, the LED driving power supply should have the ability to inhibit the intrusion of surge and protect the LED from being damaged.
6. Protection function: in addition to the conventional protection function, it is better to add LED temperature negative feedback in stable output current to prevent LED temperature from being too high.
7. Protection: the external installation type of lamps, the power structure should be waterproof and moisture-proof, and the Shell should be sun-resistant.
8.led power supply is an important factor affecting LED lamp, and the life of driving power supply should be adapted to the life of led. This has a great influence on led lamps. If there is a problem with the power supply, the consequences will be devastating. If anyone can make a breakthrough in power supply in the future, it will be a major contributor in the led field.
9. Meet safety regulations and EMC electron magnetic compatibility requirements.