LED lamp bead parameters introduction:
The brightness of the LEDs is different and the price is different.
Lamp cup: the general brightness is 60-70lm;
Bulb: The general brightness is 80-90lm.
Note: 1W brightness is 60-110lm3W brightness up to 240lm5W-300W is an integrated chip, with serial/parallel package, mainly see how much current, voltage, several strings and several.
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: 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, antistatic ability
LEDs with strong antistatic properties have a long life and are therefore expensive. LEDs with an antistatic greater than 700V are usually used for LED lighting.
LEDs with the same wavelength have the same color. If the color is the same, the price is high. It is difficult for manufacturers without LED spectrophotometers to produce pure color products.
White light warm color (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, 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.
4, leakage current
The LED is a unidirectional conductive illuminator. If there is a reverse current, it is called leakage, and the LED with large leakage current has a short life and a low price.
5, the angle of illumination
LEDs with different uses have different illumination angles. Special lighting angle, the price is higher.
The key to different qualities is life, and life is determined by light decay. Low light decay, long life, long life and high price.
7, LED chip
The illuminator of the LED is a chip, and the price of the chip varies greatly. Japan, the United States, the chip is more expensive, Taiwan and China's local manufacturers of LED
The chip grid is lower than Japan and the United States.
8, chip size
The size of the chip is expressed in terms of side length. The chip size is generally:
38-45mΩ, the quality of large chip LEDs is better than small chips. The price is proportional to the chip size.
The colloid of ordinary LED is generally epoxy resin, and the LED with anti-ultraviolet and fire retardant is more expensive. The high-quality outdoor LED lighting should be resistant to ultraviolet rays and fire.
10, color value
Positive white: 60-65, warm white: 50-60, because different companies use different packaging phosphors, so the color value is not the same.
Point source design tips
Each product will have different designs. Different designs are suitable for different purposes. The reliability design of LED lighting includes: electrical safety, fire safety, environmental safety, mechanical safety, health and safety, and safe use time. From the perspective of electrical safety, it should comply with relevant international and national standards. Since LED is a new product, China's national standards lag, but the country provides product qualification tests. LED lighting with international safety certification (such as GS, CE, UL, etc.) and national product quality certificate is expensive, because these products are reliable in safety design. Consumers are paying attention to the authenticity of the certificate. There are not many manufacturers with international safety certification and national product certification.
From the aspect of health, the price of products designed with non-toxic materials is high, especially for indoor LED lighting. Don't use cheap LED lighting with odor. At present, only a few LED manufacturers use non-toxic materials to produce and discriminate. You can use your nose directly, and the smelly products are much cheaper than the odorless ones. Toxins like lead, mercury, and cadmium require professional analysis.
From the perspective of applicable environmental safety, there is a reliable dust-proof and moisture-proof design, and the price of LED products with fireproofing, ultraviolet protection and low-temperature cracking is high. The technical parameters of LED mainly include luminous intensity, chromaticity, wavelength, color temperature and so on. Below we give a brief introduction to these parameters.
Light intensity (LuminousIntensity; IV)
Light intensity is defined as the luminous flux emitted by a unit solid angle in candela (cd). In general, the light source emits its luminous flux at different intensities in different directions, and the visible light radiation intensity emitted by the solid angle in a specific direction is called the light intensity.
The perception of color by the human eye is an intricate process. In order to quantify the description of color, the International Lighting Association (CIE) uses the visual experiment of standard observers to visualize the visual sensation caused by the radiant energy of different wavelengths. Record, calculate the color matching function of the three primary colors of red, green and blue. After mathematical conversion, the so-called CIE1931ColorMatchingFunction(x((), y((), z(())) is used, and according to this color matching function, the subsequent development Several color metric definitions allow people to describe the color. According to the CIE1931 color matching function, the human eye's stimulus value for visible light is expressed as XYZ, and the x, y value is obtained by the following formula, ie CIE1931 (x, y) color. Degree coordinates, through which the description of color is quantified and controlled.
x,y: CIE1931 Chroma Coordinates (ChromaticityCoordinates)
However, since the color gamut constructed by the (x,y) chromaticity coordinates is non-uniform, making the chromatic aberration difficult to quantify, CIE converted the CIE1931 chromaticity coordinates in 1976, so that the color gamut formed is close. Uniform chromaticity space, which allows the color difference to be quantified, ie CIE1976UCS (UniformChromaticityScale)
The chromaticity coordinate, expressed as (u', v'), is calculated as follows: the dominant wavelength (λD) is also one of the methods for expressing the color, after obtaining the chromaticity coordinates (x, y) of the device to be tested. , mark it on the CIE chromaticity coordinate map (as shown below), connect the E source chromaticity point (chromaticity coordinates (x, y) = (0.333, 0.333)) and the point and extend the connecting line, the extension line The wavelength value that intersects the spectral trajectory (horsehoe shape) is called the dominant wavelength of the device under test.
However, it should be noted that the same dominant wavelength under the marking method will represent a plurality of different chromaticity points, which is more meaningful when the chromaticity point of the device to be tested is adjacent to the spectral trajectory, and the white LED cannot be used in this way. Describe its color characteristics.
It is an auxiliary representation when the color is described by the main wavelength, and is defined as a percentage of the chromaticity coordinate of the object to be tested and the chromaticity coordinate of the E source and the spectral path of the E source to the dominant wavelength of the device to be tested.