LEDs are solid-state semiconductor devices that convert electricity directly into light. As a currently popular LED lamp, what is the parameter of the led lamp bead? This article mainly introduces the parameter description of led lamp bead and the selection skill of led lamp bead.
Led lamp bead illumination principleEditing the terminal voltage of the PN junction constitutes a certain barrier. When the forward bias voltage is applied, the barrier decreases, and the majority carriers in the P and N regions diffuse toward each other. Since the electron mobility is much larger than the hole mobility, a large amount of electrons diffuse into the P region, which constitutes injection of minority carriers in the P region. These electrons recombine with the holes on the valence band, and the energy obtained during recombination is released as light energy. This is the principle of PN junction illumination.
LED lamp bead features1. Voltage: LED lamp bead uses low voltage power supply, the supply voltage is between 2-4V, depending on the product, so it is driven by a higher voltage than the high voltage power supply; it is especially suitable for public places;
2. Current: The working current is between 0 and 15 mA, and the brightness becomes brighter as the current increases.
3. Performance: Energy consumption is reduced by 80% compared to incandescent lamps with the same efficacy.
4. Applicability: Very small, each unit LED chip is 3-5mm square, so it can be made into various shapes and suitable for variable environments.
6. Response time: The response time of the incandescent lamp is millisecond, and the response time of the LED is nanosecond.
7. Environmental pollution: no harmful metal mercury.
8. Color: Change the current to change color. The light-emitting diode can easily adjust the energy band structure and band gap of the material through chemical modification method to realize multi-color luminescence of red, yellow, green and blue. For example, a red LED with a small current can turn orange, yellow, and finally green as the current increases.
1, brightness
LED lamp beads have different brightness and different prices.
Lamp cup: general brightness is 60-70lm; bulb: 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 integrated chip, with serial/parallel package, mainly see how much current, voltage, several strings and several.
LED lens: The primary lens is generally made of PMMA, PC, optical glass, silica gel (soft silica gel, hard silica gel). The larger the angle, the higher the light efficiency. With a small angle LED lens, the light should be shot far.
2, wavelength
The wavelengths are the same and the colors are the same. The price is high.
White light is divided into warm colors (color temperature 2700-4000K), white (color temperature 5500-6000K), cool white (color temperature 7000K or more) Europeans prefer warm white.
Red light: Band 600-680, of which 620, 630 is mainly used for stage lights, and 690 is close to infrared.
Blu-ray: Band 430-480, of which 460,465 stage lights are used more.
Green light: Band 500-580, of which 525, 530 stage lights are used more.
3, the angle of illumination
LEDs with different uses have different illumination angles. Special lighting angle, the price is higher.
4, antistatic ability
LED lamp beads with strong antistatic ability have long life and high price. LED lamp beads with an antistatic greater than 700V are usually used for LED lighting.
5, leakage current
The LED lamp bead is a unidirectional conductive illuminator. If there is a reverse current, it is called a leakage current, and the LED lamp bead with a large leakage current has a short life and a low price.
LED lamp beads are widely used in lighting production, LED large-screen display, traffic lights, decoration, computers, electronic toy gifts, switches, telephones, advertising, urban glory projects and many other production areas.
1. The brightness of the brightness LED is different and the price is different. LEDs for LED luminaires shall comply with the laser class I standard.
2, anti-static ability Anti-static ability of the LED, long life, and therefore high price. LEDs with an antistatic greater than 700V are usually used for LED lighting.
3. LEDs with the same wavelength and wavelength have the same color. If the color is consistent, the price is high. It is difficult for manufacturers without LED spectrophotometers to produce pure color products.
4. Leakage current LED is a unidirectional conductive illuminator. If there is reverse current, it is called leakage, and LED with large leakage current has short life and low price.
5. LEDs with different illumination angles have different illumination angles. Special lighting angle, the price is higher. Such as the full diffusing angle, the price is higher.
6. The key to different quality of life is life, and life is determined by light decay. Low light decay, long life, long life and high price.
7. The illuminator of the wafer LED is a wafer, and the price of the wafer varies greatly. The chips in Japan and the United States are relatively expensive, and the prices of wafers in Taiwan and China are generally lower than those in Japan and the United States.
8. Wafer Size The size of the wafer is indicated by the side length. The quality of the large wafer LED is better than that of the small wafer. The price is proportional to the size of the wafer.
9, colloidal ordinary LED colloid is generally epoxy resin, LED with anti-ultraviolet and fire retardant is more expensive, high-quality outdoor LED lighting should be resistant to UV and fire.
1, indicator lights, signal lights, LED display:
LED lamps for various equipment, instruments and instrument indications;
Used for traffic signal lights, navigation lights, etc.
Used for indoor and outdoor LED display advertising signs, badges, etc.
2, special lighting
Used for fishing lights, insecticidal lamps, plant adjustment lamps;
Medical LED light;
LED lamp for projection and photography;
3, the backlight
The size backlight mainly uses RGB as the color backlight, including mobile phones, meters, etc.;
Size backlights include RGB white LEDs for notebook monitors, LCD TVs, etc.
4, car lighting
Main lighting auxiliary lighting in the car
Driving lights, brake lights, reversing lights, etc.
Auto Meter
Car headlights
5, general lighting
Outdoor lighting: such as outdoor landscape lighting, outdoor LED street lights, tunnel lights, etc., including LED lights, LED flood lights, etc.
Indoor lighting: indoor lighting mainly includes LED ceiling lamps, LED panel lights, LED bulbs, LED spotlights, table lamps, etc.
6, special lighting
Riot warning light
Miner's lamp
Aviation use
military
Emergency lighting
7, its application
Like flashlights, tool lights, Christmas lights, toys, clothing, shoe decorations, etc.
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