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LED lamp bead parameter introduce

1, brightness

LED brightness is different, the price is different.

Lamp cup: general brightness is sixty - 70 lm;

Ball steep light: general brightness for 80-90 lm.

Note: 1 w brightness is sixty - 110 lm3w brightness highest can amount to 240 lm5w - 300 w is integrated chip, with the series/parallel packaging, mainly to see how much current, voltage, a few strings and a few.

1 w red light, brightness is commonly 30 - lm; 1 w green, brightness is commonly sixty - 80 lm; 1 w yellow, brightness is commonly 30 - fifty lm; 1 w blue light, brightness is commonly twenty - lm.

LED lens: a lens general use PMMA, PC, optical glass, silica gel (soft silica gel, hard silica gel), and other materials. The greater the Angle of the efficiency of light is high, with a small Angle LED lens, the light will shoot the far.

2, antistatic ability

Antistatic ability LED, long life, so prices high. Usually antistatic more than 700 v LED to used in LED lighting.

3, wavelength

Wavelength consistent LED, same color requirements, such as the same color, the price high. No LED spectral color separation instrument manufacturer it is difficult to produce color pure product.

High power LED lamp bead detailed parameters and point source selection skills

The white light points warm color (color temperature 2700-4000 k), is white (color temperature 5500-6000 k), cold white (color temperature more than 7000 k) europeans prefer warm white

Red: band 600-680, of which 620630 is mainly used for stage light, 690 near infrared

Blue: band 430-480, of which 460465 stage light with more.

Green: band 500-580, of which 525530 stage light with more.

4, leakage current

LED is unidirectional electric light, if there is a reverse current, it is called leakage, leakage current big LED, short life and low price.

5, light Angle

Use different LED the luminous Angle is not the same. Special light Angle, the price is higher.

6, life

Different quality is the key to life, life is made of light to failure. Light failure small, long service life, long life, high price.

7, the LED chip

LED light for chip, different chip, price difference is very big. Japan, the United States of the chip is more expensive, the Taiwan factory and Chinese manufacturers LED chip prices lower than day, the United States.

Eight, chip size

The size of the chip to length of side said, chip size is commonly: - 45 m Ω, big chip LED quality is better than small chips. The price is proportional with the chip size.

9, colloid

Ordinary LED of the colloid is commonly epoxy resin and with a uv radiation and fire retardant LED price is more expensive, high quality outdoor LED lighting should be anti-ultraviolet and fire.

High power LED lamp bead detailed parameters and point source selection skills

10, color value

Is white: - 65, warm white: -, due to the different companies use the encapsulation of the phosphor powder is different, so the color value is different also.

Point light source selection skills

1, brightness LED brightness is different, the price is different. Used for LED lamps and lanterns LED should comply with the laser level Ⅰ class standard.

2, antistatic ability antistatic ability LED, long life, so prices high. Usually antistatic more than 700 v LED to used in LED lighting.

3, wavelength wavelength consistent LED, same color requirements, such as the same color, the price high. No LED spectral color separation instrument manufacturer it is difficult to produce color pure product.

4, leakage current LED is unidirectional electric light, if there is a reverse current, it is called leakage, leakage current big LED, short life and low price.

5, light Angle USES different LED the luminous Angle is not the same. Special light Angle, the price is higher. Such as full diffuse Angle, the price is higher.

6, different life quality is the key to life, life is made of light to failure. Light failure small, long service life, long life, high price.

7, wafer LED light for wafer, different wafer, price difference is very big. Japan, the United States of wafer is more expensive, general Taiwan and domestic chip prices lower than day, the United States.

8, chip size wafer to the size of the length of side said, big chip LED quality than small wafer is better. The price is proportional with the chip size.

9, colloid ordinary LED of the colloid is commonly epoxy resin and with a uv radiation and fire retardant LED price is more expensive, high quality outdoor LED lighting should be anti-ultraviolet and fire.

Each kind of product will have a different design, different design suitable for different USES, LED lighting reliability design include: electrical safety, fire safety, suitable environmental safety, mechanical safety, health and safety, safety use factors such as time. From electrical safety point of view, should be in compliance with relevant international and national standards.

Due to the LED is a new product, the Chinese national standard lag, but countries to provide qualified products testing. With international safety certification (such as GS, CE, UL, etc.) and national product quality certificate LED lighting prices are high, because these products in safety design is reliable. Consumers pay attention to is to want to be identification certificate of authenticity, now have international security authentication and the national product certificate of manufacturer is not much.

From the health, the non-toxic materials design products prices are high, especially indoor LED lighting, don't anxious to get things on the cheap choose have peculiar smell LED lighting, is currently only a few LED manufacturer is non-toxic materials production, discrimination method can directly use the nose to smell, respectively, the product is better than no odor price lower a lot. Similar lead, mercury, cadmium and toxin need professional analysis. From the applicable environmental safety look, a reliable dustproof moistureproof design, materials, fire prevention, prevent ultraviolet ray, prevent cold cracking LED product prices high.

The main technical parameters of LED luminous intensity, chromaticity, wavelength and color temperature, etc. Below we will these parameters to give brief introduction.

Light intensity (LuminousIntensity; IV)

Light intensity is defined as unit solid Angle that emit light of, the unit is candle (Candela, CD). In general, the light source will be different in different direction to emit the light intensity, in particular direction unit solid Angle of the released by visible radiation intensity is called light intensity.

Chroma (Chromaticity)

The human eye to color perception is a complicated process, in order to the description of the color quantization, the international lighting association (CIE) according to the standard observer visual experiments, will the human eye to different wavelengths of radiant energy caused by the visual perception to record, calculate the red, green, and blue trichromatic color matching function, through mathematical transformation that after the so-called CIE1931ColorMatchingFunction (x, y () (), z (()), and according to the matching function, the subsequent development of three-dimensional color metric definition, make people to use to describe color.

According to the CIE1931 matching function, will the human eye to visible light stimulation value to XYZ said, the following formula conversion get x, y value, namely (x, y) CIE1931 chromaticity coordinates, through the unified standards, to the description of the color can be quantified and controlled.

X, y: CIE1931 chromaticity coordinate values (ChromaticityCoordinates)

However, due to (x, y) chromaticity coordinates construction of color domain for heterogeneity, make the color difference are difficult to quantify said, so CIE in 1976 will CIE1931 chromaticity coordinates to conversion, make the form of color domain to be closer to the uniform color space, let the color difference can be changed, i.e., said CIE1976UCS (UniformChromaticityScale) chromaticity coordinates to (u ', v ') said, computational formula shown below:

Dominant wavelength (λ D)

It is also one of the ways to show color, the test to get a chromaticity coordinates (x, y), will be its indication on the CIE chromaticity coordinate diagram (below), link E light chrominance point (chromaticity coordinates (x, y) = (0.333, 0.333)) and point and extension the link line, the extension cord and spectrum locus (horseshoe) at the intersection of wavelength value that is called the test to a main wavelength.

But should pay attention to, this kind of marking method under the same main wavelength will represent different colour point is used to measure a colour point nearby the spectrum locus is significant, and the white light LED cannot with a way to describe the color characteristics.

Purity (Purity)

It is the main wavelength describe color of auxiliary said, in percentage points meter, defined as being tested a chromaticity coordinates and E light source of the chromaticity coordinates linear distance and E light source to the test to a dominant wavelength of the spectrum locus (SpectralLocus) chromaticity coordinates distance percentage, the higher the purity, on behalf of a test to the chromaticity coordinates is close to its the main wavelength spectrum of color, is the higher purity to test pieces, the more suitable to describe the dominant wavelength, LED color characteristic that is the case.

Color temperature (ColorTemperature)

A source of radiation energy distribution and an absolute temperature (BlackBodyRadiator) the standard blackbody radiation energy distribution phase at the same time, the light color and the blackbody radiation of the same chromaticity, the light color with corresponding absolute thermometer, the temperature called color temperature (ColorTemperature), and in the temperature of the black body radiation presented in the colour on the chromaticity diagram mark curve, called PuLang g trajectory (PlanckianLocus). Standard blackbody temperature is higher, the radiation that the human eye light produce blue stimulus, the more red stimulus composition also relatively less. However, in the actual measurement, with no light source with black body the same radiation energy distribution, in other words, stay photometric source chromaticity usually did not fall in PuLang g track. So the calculation for photometric source chromaticity coordinates of the most close to PuLang g track a coordinate point, the point of the black body temperature that is defined as the light of the correlated color temperature (CCT CorrelatedColorTemperature;), usually in CIE1960UCS (u, v) for the chromaticity diagram, and cooperate with color difference train uv are described. Must pay attention to, this kind of means for light source color PuLang grams adjacent track the other meaningful, is for LED measurement is concerned, applies only to describe the colors of white LED.

| 发布时间:2009.01.31    来源:    查看次数:4344