The first category: LED energy-saving lamps made of straw hat-type low-power LEDs, the power supply adopts a resistance-capacitance step-down circuit. Straw hat type LEDs continue to use the encapsulation form of indicator LEDs, and epoxy resin encapsulation makes the LED chips unable to dissipate heat, and the light decay is serious. After a period of use, the color temperature of many white LEDs becomes higher and gradually turns blue. It becomes dim. There are also manufacturers dedicated to the development of straw hat LEDs with low luminous decay. However, the luminous decay has not changed a lot because the packaging form has not been changed. This kind of LED energy-saving lamp products are transitional products with low price and poor quality.

The second category (5050 SMD): LED energy-saving lamps made of 3528 or 5050 SMD mid-power LEDs, the power supply also generally uses resistance-capacitance step-down circuits, and some manufacturers use constant current circuits. Compared with straw hat LEDs, paste The chip LED has better heat dissipation. It has a heat-conducting substrate, and when it is matched with an aluminum substrate, a part of the heat can be dissipated. However, due to the neglect of the heat of the LED, many medium-power SMD LED energy-saving lamps do not have a radiator and still use a plastic shell, and the light decay is still serious. The use of resistance-capacitance step-down low-end power supply, because the grid voltage is unstable, the current fluctuates, the brightness fluctuates, and the price is moderate.

The third category: LED energy-saving lamps made of high-power SMD LEDs, the power supply generally adopts a constant current isolation circuit, that is, there is a constant current, such as a 5W LED, usually 5 pieces of 1W LED chips, connected in series, adopt Constant current 300mA current source power supply, wide voltage power supply, when the grid fluctuates, the current does not change, the luminous flux, that is, the brightness remains constant, 5 SMD LEDs are welded on the aluminum substrate, and the aluminum substrate is combined with the radiator to use heat It can disperse quickly and in time to ensure that the temperature of the LED chip is lower than the allowable junction temperature of the LED, thereby ensuring the true and effective life of the LED energy-saving lamp. This kind of LED lamp is high in price and good in quality, which is also the development direction of LED energy-saving lamps.

LED energy-saving lamps have the advantages of small size, high luminous efficiency, long life, low power consumption, convenient use, etc., and are favored by consumers. So far, LED energy-saving lamps have entered thousands of households, but the LED lighting market is not very mature at this stage, and the standards of various manufacturers are different, and the national LED lighting standards have not yet been issued, which also restricts LED power lighting. The healthy development of the market.