LEDs Test Method: LED Color Measurement 2
3 Spectrophotometric Method for Measuring the Chromaticity Coordinates. According to method 2005, measure the spectrum power distribution P (λ) curve, then calculate the chromaticity coordinates of the measured device. 4 Photo electricity Integral Method for Measuring the Chromaticity Coordinates Revise the spectrum response optical system of the photoelectric detector to comply with the spectrum stimulus [...]
LEDs Test Method: Values Transfer, Principle and Method
1 Values Transfer The luminous intensity is the main optical parameters of LED device, because of the point light source and anisotropy of some LED, in the near field conditions, LED spectrophotometry test process can produce a lot of errors. So CIE recommended using the concept of the LED average intensity to as LED intensity [...]
LEDs Test Method: Photoelectric Characteristics Testing Method – Switching Time
3000 type：Photoelectric Characteristics Testing Method Method 3001: switching time 1 Objective Measure the turn on time ton (open delay time td(on) ＋rise time tr ）of the measuring LED device and the turn off time toff （closed delay time td(off) ＋decrease time tr ). 2 Test chart Picture 13 method 3001 test chart D：Measuring LED device G1：High resistance current pulse generator G2：Dc [...]
LEDs Test Method: Peak Emission Wavelength, Spectral Radiation Bandwidth and Spectrum Power Distribution
Method 2005: Peak Emission Wavelength, Spectral Radiation Bandwidth and Spectrum Power Distribution 1 Objective Measure the peak emission wavelength, spectral radiation bandwidth and spectrum power distribution of the measuring LED device under the rated condition. 2 Test chart Picture 11 method 2005 test chart D：The measuring LED device G：Current source L：Focus lens system G：Current source [...]
LEDs Test Method: Luminous Flux and Luminous Efficiency
Method 2003: Luminous Flux and Luminous Efficiency 1 Objective Measure the luminous flux and luminous efficiency of LED device being tested under the rated condition. 2 Test Chart Picture 9 Method 2003 test chart Note 1: the optical radiation lunched by the LED device under test has been reflected many times through the integral wall [...]
LEDs Test Method: Light Characteristics Measuring Methods
1 2000 type Light Characteristics Measuring Methods 1.1 Method 2001：Average LED intensity 1.1.1Objective Measure the average LED intensity of the semiconductor light-emitting diode. 1.1.2 Test chart Picture 7 Method 2001 test chart D—LED device G—Current source PD–Photometric detector including the diaphragm D1 with the area A D2、D3–Eliminate the stray light diaphram D2,D3, detection solid angle [...]
LEDs Test Method: The Electrical Characteristics Testing Methods
a）1000 type: The electrical characteristics testing methods –Method 1001: forward voltage –Method 1002: reverse voltage –Method 1003: reverse current –Method 1004: total capacitance b）2000 type: Optical characteristics testing methods –Method 2001: average LED intensity –Method 2002: half intensity angle and deviation angle –Method 2003: luminous flux and luminous efficiency –Method 2004: radiation flux and radiation [...]
Semiconductor LEDs Test Method
Abstract The system introduced the terms and definitions of semiconductor led test. On this basis, this paper introduced the requirements of the test methods and test devices in detail. Introduction Semiconductor led is a kind of important optoelectronic device, it has been widely applied in the scientific research and industrial and agricultural production. Although leds [...]
Maximum Rating and General Requirements of LEDs Test
Maximum Rating 1 The lowest and highest storage temperature（Tstg） 2 The lowest and highest working environment temperature or tube base temperature（Tamb or Tcase） 3 Inverse peak voltage（VR） Note: not used for the two pipe devices of the mutual end connection 4 The maximum continuous positive current (IF) and minus ratings curve or minus ratings coefficient in [...]
Lisun LED Test Solution and Measuring Method Part1: Electrical and Optical Characteristics
Solution: To test LED electrical characteristics ( Electrical Safety Test ), optical characteristics,switching characteristics,color characteristics, thermal characteristics and reliability. Semiconductor light emitting diode (LED) has been widely used in indicator light, signal lamp, instrument display, mobile phone backlighting, car light source and so on, especially the development of white LED technology, LED has been more [...]
The Measuring Method for the White LED Lighting
This standard is limited to the white LED lighting, which has declared that the LED test target will be limited to white LED lighting in order to limit the measuring method of comparing with the standard LED in order to effectively improve the measurement precision, and make a very detailed regulations for the contents of [...]
Lisun Group Products List Part5: LED Test Instruments
LED Test Instruments of Lisun Group: LPCE-2: This LED test system includes spectroradiometer, integrating sphere, etc. It’s for individual LED testing and LED lamp testing. UI2050: LED power supply test instrument meets GB/T 24825-2009, IEC62384:2006 and other national and international test standard of LED electrical property. FL302: The high accuracy LED goniophotometer is for CIE1997-127 [...]
Importance of LED Test Methods and the Standard of LED
In order to develop the LED lighting technology, developed countries have attached great importance to the test methods and the standard research of LED. For example the American National institute of Standards and Technology (NIST) organized the international well-known test experts to conduct the LED testing research and mainly studied LED lighting characteristics, temperature characteristic [...]
The Development of Multi-chip LED Lamp
In recent years, the development of multi-chip LED lamp or LED lamp with more tube combination have grown very quickly. However there is no domestic and foreign testing method (LED test) which is specific to LED lamp. As a kind of lighting application product, it has the relevant measurement standard set by International Electrotechnical Commission [...]
To Improve the Luminous Efficiency
To improve the luminous efficiency and the power of LED used for lighting is one of the key problems of the industrial development at present. At the same time, the and shell heat dissipation problems are particularly important. Generally we use the led thermal resistance , shell temperature and junction temperature to represent. At present, [...]
LED Quality Evaluation
Semiconductor light emitting diode (LED) has many new problems in the aspect of quality evaluation and LED test method because of its characteristics such as small volume, directional light emission, high brightness, PN electrical characteristics and so on. Different applications determine the performance requirements of LED products. From the aspect of the optical proper including [...]
