What is the difference between expensive led lights and cheap led lights?

There are many categories of LED lights, which are simply divided into two categories. One is the lamp source class, mainly spotlights, downlights, street lights, etc., play the role of lighting function. The other is the lantern class, mainly chandeliers, special-shaped lamps, floor lamps, etc., play the role of decoration and lighting.

Decorative or finished lamps, the difference between expensive and cheap is very well understood, such as chandeliers, K9 crystal chandeliers, one side is ordinary, and even glass, gum, etc., the material is not the same, the price is not the same, do not elaborate, the floor should not want to ask this. Today, talk about the core of the LED light source and power supply;

Let's start with the lamp beads

Roughly speaking, to be detailed, LED is a solid semiconductor chip that can convert electrical energy into light energy. One end of the chip is a P-type semiconductor, the other end is an N-type semiconductor, when the current passes through the chip, the electrons of the N-type semiconductor will be pushed to the P-type semiconductor, when the N-type semiconductor electrons and P-type semiconductor electrons meet, they will emit energy in the form of photons, which is the principle of LED light. And the wavelength of light, the color of light, is determined by the material that forms the P-N junction.

The core of LED light source is the crystal/chip of LED light. The chip through the epitaxy, evaporation, etching, grinding and other manufacturing processes, resulting in the chip inside the P-N electron, P-N electrode scratches, etc., will cause the conversion rate of this chip to light, there is a difference in brightness, some conversion rate is brighter, some low, we call it bare crystal brightness. In addition, each chip has a attenuation degree, that is, the efficiency change of electrical energy into light energy within a certain time, the more stable it is. In theory, the effective life of the chip can reach 100,000 hours.

After the chip is made, there is a package, that is, the LED chip is made into a lamp bead that you can see in the daily LED lamps. The role of the package is to protect the LED chip at the same time, maximize the light transmission out, and emit the heat generated by the light. At present, there are pin type positive and flip process, COB type centralized package, power type package, etc., the packaging process is different, and the final price of LED will be different. Secondly, the same package structure, the final control of heat dissipation and stability is not the same, and its price will be different.

Power supply

LED power supply, also called drive power supply, the role is one, to provide voltage regulation, constant current power supply for LED lamp beads. If the working current of the LED exceeds the rated current or the voltage is unstable, the LED will soon appear aging damage.

LED is very energy-saving, low power consumption products, the general working voltage is only a few volts, a few of the tens of volts are special purpose lamps, the use of current is also relatively low, generally in milliampere calculation, we see the daily lamps, wiring are directly connected to the household mains 220V, are first through the drive power, voltage regulation and rectification before conduction to the LED lamp bead side

Divided into isolated and non-isolated, non-isolated direct step-down is connected with LED lamps, isolated power supply is input and output through the transformer isolation, there is a process of electric to magnetic and then to electricity, safety is relatively higher than the non-isolated power supply, the cost will be more expensive. In addition, LED drive power supply in short circuit protection, surge protection, power failure protection, leakage protection and other functional guarantees, there is also a core factor affecting the final lamp price.