Types and prospects of LED energy-saving lamps

LED energy- saving lamps There are many varieties. Currently on the market, there are basically three types:

Category 1: LED energy-saving lamps made of straw-hat-shaped low- power LEDs , with a RC step-down circuit as the power supply . The straw-hat-shaped LEDs use the same packaging form as indicator LEDs, and the epoxy resin packaging makes it impossible for the LED chips to dissipate heat, resulting in serious light decay. Many white-light LEDs , after a period of use, have a higher color temperature , gradually becoming bluish and dim. Some manufacturers are also committed to developing straw-hat-shaped LEDs with low light decay, but due to the lack of changes in the packaging form, the light decay has not changed much. This type of LED energy-saving lamp product is a transitional product with a low price and poor quality.

5050 SMD LED energy-saving lamp category 2: LED energy-saving lamps made of 3528 or 5050 SMD medium-power LEDs, the power supply also generally uses a RC step-down circuit, and some manufacturers also use a constant current circuit. Compared with straw hat-shaped LEDs, SMD LEDs have better heat dissipation . They have a thermal conductive substrate and can export part of the heat when combined with an aluminum substrate. However, due to the neglect of LED heat, many medium-power SMD LED energy-saving lamps do not have a heat sink and still use a plastic shell, and the light decay is still serious. Using a low-end RC step-down power supply, due to the unstable grid voltage, the current fluctuates, the brightness also fluctuates, and the price is moderate.

Category 3: 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. For example, a 5W LED usually uses 5 1-watt LED chips in series, and uses a constant current source of 300mA for power supply. The wide voltage power supply ensures that when the power grid fluctuates, the current does not change, and the luminous flux , that is, the brightness, remains constant. The 5 SMD LEDs are welded on the aluminum substrate, and the aluminum substrate is combined with the heat sink. The heat can be dissipated quickly and timely to ensure that the temperature of the LED chip is lower than the allowable junction temperature of the LED, thereby ensuring the real effective life of the LED energy-saving lamp. This type of LED lamp has a high price and good quality, and is also the development direction of LED energy-saving lamps.

LED energy-saving lamps have the advantages of small size, high light efficiency , long life, low power consumption, and easy use, 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. The standards of various manufacturers are different, and the national standards for LED lighting fixtures have not yet been issued, which also restricts the healthy development of the LED lighting market
.