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    High power LED parameters and design skills
    1, Brightness


    LED brightness is different, different prices.


    Spotlight: General brightness 60-70lm;


    Bulbs: general brightness of 80-90lm;


    Note: 1W brightness 60-110lm3W brightness up 240lm5W-300W is an integrated chip with serial / parallel package, mainly to see how much current, voltage, and a few several strings.


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


    LED lens: a lens for general use PMMA, PC, optical glass, silica gel (soft silicone, hard silicone) and other materials. The larger the angle, the higher the efficiency of light, with a small angle of the LED lens, light to shoot too far.


    2, antistatic ability


    Antistatic ability of LED, long life, and therefore higher prices. The LED is usually static than 700V can be used for LED lighting.


    3, the wavelength


    Same wavelength LED, and color, such as requiring the same color, the price is high. No LED spectral separation device manufacturers is difficult to produce pure colors.


    Warm white points (color temperature 2700-4000K), white (color temperature 5500-6000K), Cool White (7000K color temperature above) Europeans prefer warm white.


    Red: Band 600-680, 620, 630 which is mainly used for stage lights, 690 near infrared;


    Blu-ray: the band 430-480, 460, 465 stage lights which use more;


    Green: band 500-580, 525, 530 stage lights which use more.


    4, leakage current


    LED is one-way conductive light, if there is reverse current is called leakage, leakage current is large LED, short life, low prices.


    5, light angle


    Different uses LED light emission angle is not the same. Special light-emitting angle, and higher prices.


    6, life


    Different quality is the key to life, life is determined by the light fades. Light decay, long life, long life, high price.


    7, LED chips


    LED luminous body for the chip, different chips, prices vary widely. Japan, the United States more expensive chips, Taiwan factory and China's domestic manufacturers of LED chip grid is lower than Japan and the US.


    8, the chip size


    The size of the chip to the side length of said chip size is generally:


    38-45mΩ, quality big chip LED chip is better than small. Chip size is proportional to the price of the same.


    9, colloids


    LED ordinary colloidal generally epoxy resin, plus a UV LED and fire agents more expensive, high-quality outdoor LED lighting should be UV and fire.


    10, the color value


    White: 60-65, Warm White: 50-60, due to the different companies use phosphor package is not the same, so the value is not the same color.


    Electric light design skills


    Each product will have different designs, different designs for different purposes, LED lighting design reliability include: electrical safety, fire safety, applicable environmental safety, mechanical safety, health and safety, safe use of time and other factors. From electrical safety point of view, should comply with the relevant international and national standards. Because LED is a new product, the Chinese national standard lag, but the state provides product qualification testing. With international safety certification (such as GS, CE, UL, etc.) and LED lighting price national product quality certification must be high, because these products are designed to be safe and reliable. Consumer attention is to carefully identify the certificate of authenticity, there are now international safety certification and national product certification are not many manufacturers.


    From the health aspect, the use of non-toxic materials designed product prices to be high, especially indoor LED lighting, do not choose the smell of cheap LED lighting, LED manufacturers are currently only a few are non-toxic material production, to identify ways directly with the nose respectively, the smell of the product much lower price than those without odor. Professionals need a similar analysis of lead, mercury, cadmium and other toxins.


    From the application of environmental security perspective, a reliable dust-proof design, material fire, UV, anti-low temperature cracking price LED products is high. The main technical parameters LED luminous intensity, color, wavelength, color temperature and so on. Here we give a brief introduction to these parameters.


    Light intensity (Luminous Intensity; IV)


    Light intensity is defined as a unit solid angle emitted flux, in units of candlelight (Candela, cd). In general, the light source will be in different directions with different intensity luminous flux emitted in the visible radiation intensity in a specific direction of the unit solid angle emitted light intensity that is called.


    Chroma (Chromaticity)


    The human eye's perception of color is a complex process, the visual sense in order to quantify the color description, the International Association of Lighting (CIE) according to the standard observer's visual experiments, the human eye to different wavelengths of radiation due to record, calculate the red, green, and blue color matching function, after obtained after mathematical transformation called CIE1931 Color Matching Function (x ((), y ((), z (()), and according to this matching function, the subsequent development of a number of colors metric definition, make it possible to describe the use of color, according to CIE1931 color matching functions, the human eye is visible to XYZ stimulus values expressed by the following formula obtained by converting x, y values, namely CIE1931 (x, y) chromaticity coordinates, through this unified standard description of color would have to be quantified and controlled.


    x, y: CIE1931 chromaticity coordinates (Chromaticity Coordinates)


    However, since the color gamut to (x, y) chromaticity coordinates constructed of non-uniformity, so that the color difference is difficult to quantify indicated, so CIE in 1976 will be converted CIE1931 chromaticity coordinates, so that the color gamut is close to the formed uniform color space, let the color difference can be quantified, namely CIE1976UCS (Uniform Chromaticity Scale)


    Chromaticity coordinates to (u ', v') that is calculated as follows: dominant wavelength (λD) of the color of a method which is also expressed in the chromaticity coordinates of the obtained test piece (x, y) after , which is marked on the CIE chromaticity coordinates of the map (see below), the link E light chromaticity point (chromaticity coordinates (x, y) = (0.333,0.333)) and extends to the point of the link line, this extension cord with the spectrum locus (horseshoe) wavelength values that intersects called dominant wavelength of the DUT.


    However it should be noted that such a labeling method same main wavelength chromaticity points representing a plurality of different, is a more meaning when used in DUT chromaticity point near the spectral locus, and the white LED is not possible in this way describing its color characteristics.


    Purity (Purity)


    Which is a secondary color with a dominant wavelength of Time represents described, in percent, is defined as the chromaticity coordinates of the test piece E chromaticity coordinates of the light source of the light source to the straight-line distance between the test piece E dominant wavelength of the spectrum locus.