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LED Light Beads Let You Know More About the Use of LED

1. Brightness

LED brightness is different, the price is different.

Note: the brightness of 1W is 60-110lm3w, and the brightness can be up to 240lm5w-300w. It is an integrated chip, which is packaged in series / parallel. It mainly depends on the current, voltage, series and parallel.

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

LED lens: PMMA, PC, optical glass, silica gel (soft silica gel, hard silica gel) and other materials are generally used for primary lens. The greater the angle, the higher the light output efficiency. With a small angle LED lens, the light should be far away.

2. Antistatic ability

Led with strong antistatic ability has long service life and high price. Generally, led with antistatic voltage greater than 700V can be used for LED lighting

3. Wavelength

The LED with the same wavelength has the same color. If the color is required to be the same, the price is high. It is difficult for manufacturers without led spectrophotometer to produce pure color products.

Detailed parameters of high-power LED beads and selection skills of point light source

White light is divided into warm color (color temperature 2700-4000k), normal white (color temperature 5500-6000k) and cold white (color temperature above 7000K). Europeans prefer warm white

Red light: band 600-680, of which 620630 is mainly used for stage lights and 690 is close to infrared

Blue light: band 430-480, of which 460465 stage lights are used more.

Green light: band 500-580, of which 525530 stage lights are used more.

4. Leakage current

LED is a unidirectional conductive luminous body. If there is a reverse current, it is called leakage. Led with large leakage current has short service life and low price.

5. Luminous angle

LEDs with different purposes have different luminous angles. Special luminous angle, high price.

6. Life span

The key to different quality is life, which is determined by light decay. Small light attenuation, long service life, long service life and high price.

7. LED chip

The light-emitting body of LED is chip. The price varies greatly with different chips. Chips from Japan and the United States are more expensive, and the prices of LED chips from Taiwan and Chinese manufacturers are lower than those from Japan and the United States.

8. Chip size

The size of the chip is expressed by the side length. The chip size is generally 38-45m . The quality of large chip LED is better than that of small chip. The price is directly proportional to the chip size.

9. Colloid

The colloid of ordinary LED is generally epoxy resin. The LED with anti ultraviolet and fireproof agent is expensive. High quality outdoor LED lighting should be anti ultraviolet and fireproof.

Detailed parameters of high-power LED beads and selection skills of point light source

10. Color rendering value

Positive white: 60-6, warm white: 50-60. Because the packaging phosphors used by different companies are different, the color rendering value is also different.

In terms of health, the price of products designed with non-toxic materials is high, especially indoor LED lighting. Don't be greedy for cheap and choose LED lighting with peculiar smell. At present, only a few LED manufacturers produce with non-toxic materials. The identification method can be directly separated by nose. The price of products with odor is much lower than that without odor. Toxins such as lead, mercury and cadmium need to be analyzed by professionals. From the perspective of applicable environmental safety, the price of LED products with reliable dust-proof and moisture-proof design and fireproof, ultraviolet and low-temperature cracking prevention materials is high. The technical parameters of LED mainly include luminous intensity, chromaticity, wavelength, color temperature, etc.

Let's give a brief introduction to these parameters.

Luminous intensity (IV)

Light intensity is defined as the luminous flux emitted by the unit solid angle, and the unit is candela (CD). Generally speaking, the light source will emit its luminous flux in different directions with different intensities. The visible light radiation intensity emitted per solid angle in a specific direction is called light intensity.

Chromaticity

The perception of color by human eyes is a complex process. In order to quantify the description of color, the international illumination Association (CIE) records the visual sense caused by human eyes to different wavelengths of radiant energy according to the visual experiments of standard observers, calculates the color matching function of red, green and blue, and obtains the so-called cie1931colormatching function after mathematical conversion (x ((), y ((), Z (()), and according to this color matching function, several color measurement definitions have been developed, so that people can describe and use color.

According to the CIE1931 color matching function, the stimulation value of human eyes to visible light is expressed in XYZ, and the X and Y values are converted by the following formula, that is, CIE1931 (x, y) chromaticity coordinates. Through this unified standard, the description of color can be quantified and controlled.

x. Y: CIE1931 chromaticity coordinates

However, because the color gamut constructed by (x, y) chromaticity coordinates is non-uniform, it is difficult to quantify the color difference. Therefore, CIE converted CIE1931 chromaticity coordinates in 1976 to make the color gamut close to uniform chromaticity space, so that the color difference can be quantified, that is, CIE1976 UCS (uniform chromaticity scale) chromaticity coordinates, expressed in (U ', V') Indicates that the calculation formula is as follows:

It is also one of the methods to express color. After obtaining the chromaticity coordinates (x, y) of the part to be tested, mark it on the CIE chromaticity coordinate diagram (as shown below), connect the chromaticity point of e light source (chromaticity coordinates (x, y) = (0.333,0.333)) with the point and extend the connecting line. The wavelength value intersected by the extension line and the spectral track (horseshoe shape) is called the main wavelength of the part to be tested.

However, it should be noted that under this marking method, the same main wavelength will represent multiple different chromaticity points, which is more meaningful when the chromaticity points of the part to be tested are adjacent to the spectral track, while the white LED cannot describe its color characteristics in this way.

Purity

It is an auxiliary representation when the color is described by the main wavelength. In percentage, it is defined as the linear distance between the chromaticity coordinate of the object to be tested and the chromaticity coordinate of the e light source and the spectral locus from the e light source to the main wavelength of the object to be tested The percentage of chromaticity coordinate distance. The higher the purity, the closer the chromaticity coordinate of the part to be measured is to the spectral color of the main wavelength. The higher the purity of the part to be measured, the more suitable it is to describe its color characteristics with the main wavelength. LED is an example.

Color temperature

When the radiation energy distribution of a light source is the same as that of a standard blackbody radiator at an absolute temperature, the chromaticity of the light source is the same as that of the blackbody radiation. At this time, the chromaticity of the light source is measured by the corresponding absolute thermometer. This temperature is called color temperature The chromaticity of blackbody radiation at various temperatures can be plotted on the chromaticity diagram, which is called Planckian locus The higher the temperature of the standard blackbody in orbit, the more blue stimulus to human eyes and the less red stimulus. However, in actual measurement, no light source has the same radiation energy distribution as the blackbody. In other words, the chromaticity of the light source to be measured usually does not fall on the Planck track. Therefore, the chromaticity coordinates of the light source to be measured are calculated to be the closest to the Planck track The blackbody temperature of a coordinate point on the trace is defined as the correlated color temperature (CCT) of the light source, usually cie1960ucs (U, V) It should be noted that this representation is meaningful only when the chromaticity of the light source is close to the Planck trajectory, so it is only applicable to the color description of white LED for LED measurement.

Rectangular group is a listed company specializing in LED packaging, with quality assurance

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