What are the disadvantages of LED energy-saving lamps?
Guide: LED energy-saving lamps as a category of LED general lighting, the name is derived from traditional lighting bulbs, energy-saving lamps. The shape of the LED energy-saving lamp is similar to that of the traditional energy-saving lamp, and the shape can satisfy the traditional aesthetics of the consumer. The characteristics of LED energy-saving lamps: low cost, high luminous efficiency, large luminous area, no glare, no ghosting. The following small series will introduce you to the types of LED energy-saving lamps and the shortcomings of LED energy-saving lamps.
What are the types of LED energy-saving lamps:
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 energy-saving lamp is extended by the LED form of the indicator light, and the epoxy resin is packaged, so that the LED chip can not dissipate the heat, and the light decay is serious. Many white LED energy-saving lamps become high in color temperature after being used for a period of time. It is blue and dark. There are also manufacturers dedicated to the development of low-light faded straw-type LED energy-saving lamps, but because 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.
The second category: LED energy-saving lamps made of 3528 or 5050 chip power LEDs, power supply is also commonly used to resist the capacity of the buck circuit, and some manufacturers use constant current circuit, compared to straw hat type LED energy-saving lamps, SMD LED energy-saving lamps The heat dissipation is slightly better, and there is a heat-conducting substrate. When the aluminum substrate is matched, a part of the heat can be led out. 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. The RC is used to reduce the voltage of the grid, the current is fluctuating, the brightness is fluctuating, the price is moderate, and the quality is slightly better.
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 energy-saving 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.
Disadvantages of LED energy-saving lamps:
1. LED energy-saving lamps require corresponding heat sinks. In the case that the heat generation of the LED chips itself is not greatly improved, it is necessary to further develop the structure of the heat sink and the application of heat pipe technology.
2, LED energy-saving lamps, the price is too high, LED single price, aluminum radiator, high-efficiency constant current power supply, high light transmittance soft lampshade, the four cost collectively push up the LED cost.
3, LED energy-saving lamps, the lack of uniform standards, the quality of LED energy-saving lamps produced by various enterprises are mixed, there are many uncertainties in light efficiency, color rendering and life.
Standard Recovery Stud Diode are mainly used for rectifying and switching
It has positive pressure reduction (0.4v -- 1.0v), short reverse recovery time (2-10ns nanosecond), large reverse leakage current, low pressure resistance, generally lower than 150V, and is used in low voltage situations.
Diodes are electronic devices that have two electrodes that allow only a single current to flow in a single direction.Varicap bond (bond) is an electronic adjustable capacitor.Most diodes have a current orientation that we call reading "rectifier".The most common function of a diode is to allow only the current to pass in one direction (called forward bias) and to block in the opposite direction (called reverse bias).
Standard Recovery Stud Diode,Standard Recovery Diode,400V Standard Recovery Diode,Stud Diode
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