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What are the parameters of LED lamp beads? How to choose the right LED lamp beads

　　LED is a solid-state semiconductor device that can directly convert electricity into light. As a popular LED lamp, what are the parameters of LED lamp beads? This article mainly introduces the LED lamp bead parameter description and the LED lamp bead selection skills.

　　LED lamp bead luminescence principle

　　Edit the terminal voltage of the PN junction constitutes a certain potential barrier. When a forward bias voltage is applied, the potential barrier drops, and the majority carriers in the P and N regions diffuse to each other. Since the mobility of electrons is much greater than that of holes, a large number of electrons will diffuse to the P region, which constitutes the injection of minority carriers in the P region. These electrons recombine with the holes in the valence band, and the energy obtained during the recombination is released in the form of light energy. This is the principle of PN junction light emission.

　　LED lamp beads characteristics

　　 1. Voltage: LED lamp beads use low-voltage power supply, the power supply voltage is between 2-4V, depending on the product, so it is driven by a higher-voltage power supply; a safer power supply, especially suitable for public places;

　　 2. Current: The working current is 0-15mA, and the brightness becomes brighter with the increase of current

　　3. Efficiency: The energy consumption is reduced by 80% compared with incandescent lamps with the same light effect.

　　4. Applicability: small, each unit LED chip is 3-5mm square, so it can be prepared into various shapes of devices, and is suitable for variable environments.

　　6. Response time: The response time of the incandescent lamp is milliseconds, and the response time of LED lights is nanoseconds.

　　7. Environmental pollution: no harmful metal mercury.

　　 8. Color: Changing the current can change the color. The light-emitting diode can be easily chemically modified to adjust the band structure and band gap of the material to achieve red, yellow, green, blue, and orange multi-color light. For example, when the current is low, the LED is red, as the current increases, it can turn into orange, yellow, and finally green.

　　LED lamp bead parameter description

　　1. Brightness

　　 The brightness of LED lamp beads is different, and the price is different.

　　 Lamp cup: general brightness is 60-70lm; bulb lamp: general brightness is 80-90lm.

　　1W red light, the brightness is generally 30-40lm; 1W green light, the brightness is generally 60-80lm; 1W yellow light, the brightness is generally 30-50lm; 1W blue light, the brightness is generally 20-30lm.

　　Note: 1W brightness is 60-110lm; 3W brightness is up to 240lm; 5W-300W is an integrated chip, which is packaged in series/parallel. It mainly depends on how much current, voltage, how many strings and how many parallels.

　　LED lens: PMMA, PC, optical glass, silica gel (soft silica gel, hard silica gel) and other materials are generally used for the primary lens. The larger the angle, the higher the light output efficiency. With a small-angle LED lens, the light must be shot farther.

　　2. Wavelength

　　 The wavelength is the same, and the color is the same. The price is high.

　　 White light is divided into warm colors (color temperature 2700-4000K), pure white (color temperature 5500-6000K), cool white (color temperature above 7000K) Europeans prefer warm white.

　　 Red light: Wave band 600-680, of which 620 and 630 are mainly used for stage lights, and 690 is close to infrared.

　　 Blue light: Band 430-480, of which 460 and 465 stage lights are used more.

　　 Green light: Wave band 500-580, of which 525 and 530 stage lights are used more.

　　3. Light-emitting angle

　　 LEDs with different purposes have different light-emitting angles. Special lighting angle, higher price.

　　4. Antistatic ability

　　 The LED lamp beads with strong antistatic ability have long life and high price. Usually, only LED lamp beads with antistatic value greater than 700V can be used for LED lighting.

　　5. Leakage current

　　 LED lamp bead is a unidirectional conductive luminous body. If there is a reverse current, it is called leakage. LED lamp beads with large leakage current have short life and low price.

　　 LED lamp beads are widely used in many production fields such as lighting, LED large-screen display, traffic lights, decoration, computers, electronic toys and gifts, switches, telephones, advertising, and urban brilliance projects.

　　LED lamp bead selection skills

　　 1. Brightness The brightness of the LED is different, and the price is different. The LEDs used in LED lamps should meet the laser class Ⅰ standard.

　　2. Antistatic ability The LED with strong antistatic ability has a long life, so the price is high. Generally, LEDs with anti-static voltage greater than 700V can be used for LED lighting.

　　3. LED with the same wavelength have the same color. If the color is required to be the same, the price is high. It is difficult for manufacturers without LED spectrophotometers to produce products with pure colors.

　　4. Leakage current LED is a unidirectional conductive light-emitting body. If there is a reverse current, it is called leakage. LEDs with large leakage current have short life and low price.

　　5. Light-emitting angle LEDs with different uses have different light-emitting angles. Special lighting angle, higher price. Such as full diffusion angle, the price is higher.

　　6. Life span The key to different qualities is life span, and life span is determined by light decay. Low light decay, long life, long life, high price.

　　7. Chip LED's luminous body is a chip, and the price of different chips varies greatly. Chips in Japan and the United States are more expensive. Generally, the prices of chips made in Taiwan and China are lower than those in Japan and the United States.

　　 8. Chip size The size of the chip is expressed by the side length. The quality of the large chip LED is better than that of the small chip. The price is proportional to the size of the chip.

　　9. Colloid The colloid of ordinary LEDs is generally epoxy resin. LEDs with anti-ultraviolet and fire retardants are more expensive. High-quality outdoor LED lighting should be anti-ultraviolet and fireproof.

　　 LED light application

　　1. Indicator light, signal light, LED display:

　　 LED lights for various equipment, instruments, and meter indications;

　　 Used for traffic lights, ship lights, navigation lights, etc.;

　　 Used for indoor and outdoor LED display advertising signs, badges, etc.

　　2. Special lighting

　　Used for fishing lights, insecticidal lights, plant adjustment lights;

　　Medical LED lamp;

　　 LED lights for projection and photography;

　　3. Backlight

　　 Size backlight mainly uses RGB as color backlight, including mobile phones, meters, etc.;

　　Size backlight including RGB white LEDs for laptop monitors, LCD TVs, etc.

　　 4. Automotive lighting

　　 Main lighting and auxiliary lighting in the car

　　 Driving lights, brake lights, reversing lights, etc.

        Auto Meter

　　 Car headlights

　　 5. General lighting

　　Outdoor lighting: Lamps such as outdoor landscape lighting, outdoor LED street lights, tunnel lights, etc., including LED strips, LED floodlights, etc.

　　Indoor lighting: indoor lighting mainly includes LED ceiling lights, LED panel lights, LED bulb lights, LED spotlights, table lamps, etc.

　　 6. Special lighting

　　 Anti-riot police lights

　　 Miner's lamp

　　 Aviation

　　 Military

        Emergency lighting

　　 7. Its application

　　Like flashlights, tool lights, Christmas lights, toys, clothing, shoe decorations, etc.