Energy-saving lamps have withdrawn from the stage of history. At present, almost all household lamps are LED lamps. However, there are so many LED lamps on the market that it is difficult to distinguish the good from the bad. This short article teaches you how to choose high-quality LED lamps.
LED lamps actually consist of three parts: driver, light source board, and heat sink. First, let's talk about the driver. Normal household LED lights generally choose non-isolated drivers. This driver has average cost, high efficiency, and good reliability. The lights can work normally without being affected by voltage fluctuations. However, in order to compete with prices in the current market, many companies will use resistor-capacitor step-down or linear power supplies instead of non-isolated power supplies. These two power supplies have poor impact resistance. If a nearby thunderstorm causes a surge voltage, it will most likely cause damage. , can only work at a set voltage, such as 220V in our country. As long as the voltage fluctuates, the light will also fluctuate, so when purchasing, be sure to check the input voltage range. Generally, the voltage of 220-230v is written for resistance, capacitance and linearity. Non-isolated power supplies are generally written as 175-250v and some can be 110-250v. Voltage fluctuations have no effect on the lamp. The chip inside will automatically adjust the duty cycle of the square wave to achieve stable output, so be sure to check the input voltage range when choosing. .
Next, let's talk about the light source board. At present, most of the LED light sources are welded on the aluminum substrate. It is difficult to see the quality of the light source with the naked eye, but generally it is not a problem after a few years of use. But you can look at the light on the package. For color temperature, it is generally better to choose a color temperature below 6000k. European and American countries like a color temperature of around 3000k, which is slightly yellowish like the sun just rising in the morning. In our country, we like whiter ones. Generally, 6000k is like the sun at noon. It is whiter, but more dazzling. It is best to choose a 4000k light source, which is more moderate. If it exceeds 6000k, the light is actually bluish. This is what is called blue light hazard, so do not choose a color temperature above 6000k.
Finally, let's talk about the heat sink. Since the LED light source generates heat when it is working, if the heat is not dissipated in time, it will damage the LED, so a heat sink is needed. Generally, the bulbs on the market are plastic-coated aluminum heat sinks, which means they feel like plastic to the touch. , there is actually a layer of aluminum inside. The greater the power of the LED, the greater the heat. Generally, the heat sink has a maximum power limit, so when buying a lamp, do not be greedy for high power. Generally, the A60 should not exceed 10 watts. If it exceeds the lifespan, it will be discounted.
