LED energy-saving lamps are abundant in variety, and currently there are basically three types in the market:
One type: LED energy-saving lamps made of straw-type low-power LEDs, the power supply adopts a RC circuit. The straw hat type LED is extended by the LED package form, and the epoxy resin package makes the LED chip unable to dissipate the heat. The light decay is serious. Many white LEDs become high in color temperature after a period of use, and gradually become blue. It becomes dim. There are also manufacturers who are committed to the development of straw-type LEDs with low light decay, but since there is no change in the package form, the light fade has not changed much. This type of LED energy-saving lamp products is a transitional product with low price and poor quality.
5050 SMD LED Energy Saving Lamp
The second category: LED energy-saving lamps made of 3528 or 5050 chip power LEDs, power supply is also commonly used to resist the capacitance of the buck circuit, and some manufacturers use constant current circuit, compared to straw hat type LED, SMD LED heat dissipation is slightly better, There is a heat-conducting substrate, and a part of the heat can be led out by the aluminum substrate. However, due to the neglect of the heat of the LED, many medium-power SMD LED energy-saving lamps, without a heat sink, still use a plastic casing, the light fade is still serious. Resistor-capacitor step-down low-end power supply, because the grid voltage is unstable, the current fluctuates, the brightness also fluctuates, the price is moderate, and the quality is slightly better.
High-power LED energy-saving lamp
Three types: LED energy-saving lamps made of high-power SMD LEDs, the power supply generally uses a constant current isolation circuit, that is, there is a constant current, such as 5W LED, usually using 5 1 watt LED chips, connected in series, using constant The current source of 300mA is supplied, and the wide voltage power supply makes the current not change when the power grid fluctuates. The luminous flux is kept constant. The five chip LEDs are soldered on the aluminum substrate, and the aluminum substrate is combined with the heat sink to use heat. Dissipate in time and quickly to ensure that the temperature of the LED chip is lower than the allowable junction temperature of the LED, thus ensuring the true and effective life of the LED energy-saving lamp. Such LED lamps are expensive and of good quality, and are also the development direction of LED energy-saving lamps.
A good LED energy-saving lamp should consist of four parts: a high-quality LED chip, a constant-current isolated power supply, a suitable heat sink with respect to the power of the lamp, and a light diffusing effect that is soft and does not see the light source of the light source.
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