Theories About Light Part4: V(λ) Function
In order to have also a well defined photometer, an “artificial eye” has been constructed to simulate the light sensitivity of the human eye. The relative response of the normal human eye to monochromatic light at the different spectral frequencies was determined experimentally by the CIE and standardized in 1924. This is known as the […]
Testing Rules for Lighting Products Part3: Life Test and Aging Test
E: Life Test. The main test equipment: the power supply, the constant temperature chamber, thermometer, pressure regulator, the voltmeter Number of tests: the 10. 1.The main test projects: the working life under high temperature and high pressure Test method 1: connect the lamps and lanterns to 250 V, open the power supply of the constant […]
Theories About Light Part3: Illuminance Luminance and Colorimetry
Illuminance and Luminance Illuminance is another quantity derived from intensity which denotes luminous flux density. It has a special name, lux, and is lumens per square meter, or lm/m2. The symbol is Ev. Most light meters measure this quantity, as it is of great importance in illumination engineering. Some examples for typical illuminances range from 100,000 […]
Lisun Group Products List Part2: Spectrophotometer
Spectrophotometer of Lisun Group: LPCE-1: It’s a spectroradiometer, integrating sphere test system. The measured data meets the requirements of CIE and IES_LM-79. LMS-9000: High speed and high array optical spectrometer is an automated test system for identifying the performance of LEDs by measuring the photometry, colorimetry and electricity. LMS-8000: CCD spectrometer LED Measurement System is an automated measurement system for […]
Theories About Light Part2: Photometry and Luminous flux
Photometry Photometry is the light measurement, which is defined as electromagnetic radiation detectable by the human eye (daylight). It is thus restricted to the wavelength range from about 380 to 780 nanometers (1000 nm = 1 μm). Photometry is just like radiometry except that everything is weighted by the spectral response of the eye. Visual […]
Basic Theories About Goniophotometer Part4: How to Determine the Right Measuring Distance When Measuring the Luminous Intensity Distribution
The equation [I(γ)=d*d*E(γ)] only applies when the distance d is large enough to view the lamps or luminaries as a point source approximately. EN 130-1:2004 specifies the requirements of measurement distance: The measurement distance shall be at least 5 times the largest luminous dimension of the test source. However for luminaries with distributions significantly different […]
Our Engineer in Croatia With Our Croatia Customers
Lisun Electronics engineer went to Croatia to install the instruments for our customers. About Lisun Group: Lead in CFL and LED Tester. Click to our product lists: Goniophotometer Spectroradiometer Integrating Sphere Colorimeter and Photometer LED Test Instruments CFL Testing Instruments EMC testing Electronic Ballast Tester Equipments for Testing Electronic components Electrical Safety Tester Environmental Chamber AC and DC power supply Spectrophotometer Download our E-catalog: http://www.lisungroup.com/article-id-47.html
Theories About Light Part1: Visible Light and Intensity
Intensity: The candela is the basic unit in photometry. All other luminous quantities can principally be derived from it. The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540×1012 Hertz and that has a radiant intensity in that direction of 1/683 Watt per Steradian. One steradian […]
Testing Rules for Lighting Products Part2: Low Temperature Test and High Pressure Experiment
C: Low Temperature Test. The main test equipments: the power supply, low temperature chamber, thermometer, pressure regulator, the voltmeter and clock. Number of Tests: 10. 1. The main test projects: low temperature starting Test methods: Put the lamps and lanterns in the low temperature humidity chamber, connect the rated voltage power supply, set the temperature […]
Basic Theories About Goniophotometer Part3: Spatial Luminance Distribution and Spatial Spectral Distribution
Spatial Luminance Distribution and Near-field Goniophotometer The spatial luminance distribution and the size of emitting area different directions are important quantities, especially for the glare performance estimation. The imaging luminance meter based on CCDs receives the light from the source directly, and measure the luminance (luminance meter) of every point in the emitting area as […]
Testing Rules for Lighting Products Part1: High Temperature Test and High Pressure Experiment
A: High Temperature Test The main testing equipments: the constant temperature humidity chamber, thermometer, pressure regulator, the voltmeter and clock. The main test projects: high temperature and low voltage starter, high temperature and safety operation. Number of tests: 10. Test methods: Put the lamps and lanterns under test in the constant temperature chamber, connect the […]
Light Biological Safety of the LED Products
With the wide application of LED products, how to guarantee the light biological safety of the LED products that have gone into the market has been the problem concerned by international industry currently. The international electro technical commission product compliance testing and certification organizations IECEE are establishing the corresponding products authentication standard. How to do […]
Basic Theories About Goniophotometer Part2: High Accuracy Measurement for Luminous Flux
2. High accuracy measurement method for luminous flux of luminaries and lamps The derivation of luminous flux from a measurement of illuminance distribution of a light source is the method which can usually achieve very high accuracy. The measurement principle can be expressed as: φ=∫E*dS (s) This is also the method for many developed countries […]
China Has Achieved a Significant Breakthrough in LED International Standards.
Semiconductor lighting is one of the hot industries that rise at the beginning of this century and catch the global interest and high attention from many countries. LED lighting is the core of semiconductor devices, because its PN junction gives out light, and has the characteristics of high brightness, high photosynthetic efficiency, long life, environmental […]
Lisun Group Products List Part1: Goniophotometer
Goniophotometer of Lisun Group: LSG-1800: With facility of double arms for turning the light source. When doing light measurement, the long measuring distance can easily be achieved. LSG-2000: Mirror on optical axis. When measuring light source, the holder for light source has to move in a large space during the measurement. LSG-1900: Lamp on optical axis. It overcomes […]
IP(International Protection) Level System
IP (INTERNATIONAL PROTECTION) protection level system is drawn up by the IEC (INTERNATIONAL ELECTROTECHNICAL COMMISSION), and will be classified in accordance with the characteristics of preventing the dust and the moisture. Here the external things include tools, fingers which can not touch the live part of the lamps and lanterns, so as not to get […]
What is CIE1931?
Since the childhood, when we talk about the colour, we have to refe to the concept of threegezerand three primary colors. we can see that, colour is a 3 D function, so it should be said as the three dimensional space. As shown in figure 1, it is the color spindle that is commonly used […]
Basic Theories About Goniophotometer Part1: Luminous Intensity Measurement
Main functions and basic principle of goniophotometer 1. Goniophotometer for luminous intensity measurement. A goniophotometer is a photometer for the measurement of the angular dependence of a photometric quantity, that is why “goniophotometer” has been named. It is applied widely t measure te luminous intensity distribution, luminous flux and efficiency of lamps and luminaries. Take […]
Photos From One of Our Romania’s Customer
This customer ordered LSG-1800 goniophotometer, spectrophotometer and integrating sphere system from us. These photos shows the instruments that under installation. About Lisun Group: Lead in CFL and LED Tester. Click to our product lists: Goniophotometer Spectroradiometer Integrating Sphere Colorimeter and Photometer LED Test Instruments CFL Testing Instruments EMC testing Electronic Ballast Tester Equipments for Testing Electronic components Electrical Safety Tester Environmental […]
LED Backlight Standard
Our LED backlight standard is mainly organized and developed by the flat panel display technology standard working group of Industry and Information Technology (MIIT). In 2008, Flat panel display technology standard working group proposed to our country the “liquid crystal display panels backlight” standard system, which includes a total standard of backlight, guide points of […]
LED BLU Standards
Growing market requires the LED BLU standards, which has been the hot topics in the industry. Because LCD TV with LED backlighting has better color quality, better dynamic image, longer service life, and can achieve lower power consumption with the dynamic control technology in the area, the market share of LCD TV with LED backlighting […]
Our Engineer Went to Germany to Install Instruments for Our Customer
One of our customer from Germany, they ordered Goniophotometer, Integrating Sphere and Spectrophotometer system from us. The pictures shows our engineer went to Germany to install the instruments for them. About Lisun Group: Lead in CFL and LED Tester. Click to our product lists: Goniophotometer Spectroradiometer Integrating Sphere Colorimeter and Photometer LED Test Instruments CFL Testing Instruments EMC testing Electronic Ballast […]
Photometric Terms
Luminous flux: Φ, Lm Luminous flux is the sum total of the amount of light per second generated by the illuminant. Light intensity: I, cd The luminous intensity is the luminous flux from a point source emitted per unit solid angle in a given direction. A goniophotometer can be used for measuring light intensity. Illuminance: […]
LSG-2000: Goniophotometer with Rotating Mirror
Function of LSG-2000 for measuring light: It is the most popular goniophotometer with rotating mirror used by global international laboratory (including the nine global laboratories such as Philips). International Commission on Illumination CIE NO.70 recommended that the standard structure should be used to measure the space light intensity distribution and many other photometric parameters of […]
LSG-1800: Rotation Luminaire Goniophotometer
Function of this light measurement: According to the requirements of the National Standards, CIE, IESNA, through the rotating lamps and lanterns, to realize many measurement methods such as B-β, A-a and C-γ, etc. These methods are used for light intensity measurement and many other photometric parameters of indoor lighting lamps and lanterns, throwing light lamps and […]
Power Saving and Environmental Protection
The energy of power generation mainly are the fire (coal, oil and gas), hydraulic and atomic energy. For coal-fired power plant inChina, mainly two-thirds are coal. Power saving is very important to protect the environment. In the case of thermal power generation, each production of 1 KWH, the air pollutants are burning coal, burning oil, […]
Green Lighting and Environmental Protection
In the 1980s, facing the world energy crisis and the rise of global environmental protection, the energy saving and global environment protection will become the consensus of all mankind. In January 1991, the Environmental Protection Agency (EPA) first puts forward the “Green Lights” and “Green Lights Program” concept. It soon got support from the UN. […]
IEC TC34 Standard
IEC60968-1999 Self-ballasted lamps for general lighting services – Safety requirements IEC60969-2001 Self-ballasted lamps for general lighting services – Performance requirements IEC60972-1991 Classification and interpretation of new lighting products IEC60983-1995 Miniature lamps IEC61126-1996 Procedure for use in the preparation of maximum lamp outlines IEC61127-1992 High pressure xenon short arc lamps – Dimensional, electrical and photometric data and cap types IEC61167-1998 Metal halide lamps IEC61195-1999 Double-capped fluorescent lamps – Safety specifications IEC60434-1984 Aircraft electrical filament lamps IEC60634-1993 Heat test source (H.T.S.) lamps for carrying out heating tests on lu minaires IEC60155-1995 Glow-starters for fluorescent lamps IEC60682-1997 Standard method of measuring the pinch temperature of quartz-tungsten-halogen lamps IEC60360-1998 Standard method of measurement of lamp cap temperature rise IEC60432-1-1999 Incandescent lamps – Safety specifications – Part 1: Tungsten filament lamps for domestic and similar general lighting purposes IEC60432-2-1999 Incandescent lamps – Safety specifications – Part 2: Tungsten halogen lamps for domestic and similar general lighting purposes IEC60081-2000 Double-capped fluorescent lamps – Performance specifications IEC61547-2000 Equipment for general lighting purposes – EMC immunity requirements IEC60188-2001 High-pressure mercury vapour lamps – Performance specifications IEC60192-2001 Low-pressure sodium vapour lamps – Performance specifications IEC60064-2002 Tungsten filament lamps for domestic and similar general lighting purposes Performance requirements IEC60357-2002 Tungsten halogen lamps (non vehicle) – Performance specifications IEC60432-3-2002 Incandescent lamps – Safety specifications – Part 3: Tungsten halogen lamps (non-vehicle) IEC60630-2002 Maximum lamp outlines for incandescent lamps IEC60662-2002 High-pressure sodium vapour lamps IEC60809-2004 Lamps for road vehicles – Dimensional, electrical and luminous requirements […]
