Types and prospect analysis of LED energy-saving lamps

'China Building Materials Network' has a wide variety of LED energy-saving lamps. At present, there are basically three types on the market: one type: LED energy-saving lamps made of straw hat-type low-power LED, and the power supply adopts RC Buck circuit. The straw hat type LED continues to be packaged in the form of indicator light LED and epoxy resin, so that the LED chip cannot dissipate heat and the light decays seriously. Many white LEDs have a higher color temperature after being used for a period of time, gradually turned blue and became dim. Some manufacturers are also committed to developing straw hat LED with low light attenuation, but the light attenuation has not changed greatly because the packaging form has not changed. This kind of LED energy-saving lamp products are transitional products with low price and poor quality. 5050 patch LED energy-saving lamps Class II: LED energy-saving lamps made of 3528 or 5050 patch medium-power LED, power supply also generally adopts resistance-capacitance Buck circuit, and some manufacturers also adopt constant current circuit, compared with Straw Hat LED, the patch LED has slightly better heat dissipation and has a heat conducting substrate, which can export part of the heat when matched with an aluminum substrate. However, due to the neglected heat of LED, many medium-power patch LED energy-saving lamps still use plastic shells without radiators, and the light attenuation is still serious. The low-end power supply with resistance-capacitance and voltage reduction is adopted. Due to the unstable voltage of the power grid, the current fluctuates, the brightness fluctuates, and the price is moderate. Three types: LED energy-saving lamps made of high-power patch LED. The power supply generally adopts constant current isolation circuit, I . e. there is a constant current, such as 5W LED, usually, 5 pieces of 1 watt LED chips are connected in series, and constant current 300mA current source is used for power supply and wide voltage power supply, so that when the power grid fluctuates, the current does not change and the luminous flux, I . e. brightness, remains constant, five patch LEDs are welded on the aluminum substrate, and the aluminum substrate is combined with the radiator, so that the heat can be quickly dissipated in time to ensure that the temperature of the LED chip is lower than the allowable junction temperature of the LED, so as to ensure the true and effective life of LED energy-saving lamps. This kind of LED lamp has 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 volume, high luminous efficiency, long service life, low power consumption, convenient use and the like, and are favored by the vast number of 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 LED lighting standards have not yet been introduced, this also restricts the healthy development of LED lighting market.