Measuring Luminous Intensity Distribution With a Goniophotometer

Original Article: http://www.lisungroup.com/blog/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 from a cosine, the above ratio will give rise to errors in excess of 1%. For such luminaries a measurement distance ratio in excess of 10:1 may be needed.

The minimum measuring distance for a floodlight with reflector can be determined by the distance of “beam cross over” point as [D min=a*a*(2a/5+1)/4f+2af/s].

However, the measuring distance can not be too large either, it is firstly limited by the space of the darkroom, and secondly it is limited by the sensitivity of the photometer detector. Generally said, for large luminaries, the measuring distance of 20-30 meters is reasonable.

About Lisun Group:

Lead in CFL and LED Tester. Click to our product lists:

Goniophotometer
Spektrofotometer
Integrating Sphere
Colorimeter
Photometer
LED Test Instruments
CFL Test instruments
EMC testing
Electronic Ballast Tester
Equipments for Testing Electronic components
Electrical Safety Tester
Environmental testing equipment
AC and DC power supply
Spectrophotometer

Lighting Test Rules: High Pressure and High Temperature Experiment

Original Article: http://www.lisungroup.com/blog/high-temperature-test-and-high-pressure-experiment/

A: High Temperature Test

The main testing equipments: the constant temperature 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 circuit, raise the output voltage of the voltage regulator to 180 V (pressure regulator for the lamps and lanterns only power the lamps and lanterns under test), open the power supply of the constant temperature chamber, set the temperature at60℃, open the power source of the lamps and lanterns when the temperature rises to60 ℃, observe whether the lamps and lanterns work normally, and then raise the pressure regulator to 250 V and let it work for 24 hours, watch the experiment result. When meeting the abnormal phenomenon of the damage of the lamps and lanterns or the deformation of the heated materials, the experiment is not qualified.

B: High Temperature High Pressure Shock Initiation Test

The main test equipments: the constant temperature chamber, thermometer, pressure regulator, the voltmeter and clock.

The main test projects: high temperature starting performance and reliability

Number of tests: 10.

Testing methods: According to the above experiment, under the condition of high temperature, raise the voltage regulator to 250 V, switch the lamps for three times and each time interval is no less than eight seconds (8 seconds means that all the capacitance of the lamps and lanterns discharge to reduce the mutual interference), and in the process, lamps and lanterns should not be damaged, otherwise they will be considered as not qualified.

About Lisun Group:

Lisun Electronics Inc. issued her 2012 version product catalog. Due to the LED industry developed this years, Lisun designed and produced a series high accuracy and high quality LED tester.

High and Low Temperature & Humidity Chamber (GDJS-*B): Different size can be chosen. It used for LED lamp test in high and low temperature condition to measure the quality.

System of Goniophotometer (LSG-2000 or LSG-1800): This system is according to CIE, LM-79 & LM-80 and other lighting international standards. The customer can use it for measuring light intensity distribution curve, export IES files for DiaLux software to re-design the lighting products. It is widely used in LED indoor and outdoor manufactory and lab design center.

Instruments for EMC Testing (EMC500 and ESD61000-5): The LED products sell to Europea are request CE certificate, the EMC Test Instruments are used to measure whether meet CE request.

Spectrophotometer (spektrofotometer) & Integrating Sphere Test System (LPCE-1): This system is suitable for photometric and colorimetric measurement of luminaries such as Energy-saving lamp, Fluorescent lamp, HID lamp (high voltage sodium lamp and high voltage mercury lamp), CCFL and LED. The measured data meets the requirements of CIE and IES_LM-79 for the measurement of photometry and colorimetry.

AC and DC Power Supply: Different voltage and current Power supply can be chosen. It make sure the measuring lamp get a stably test condition on power supply.

Other important products:
Integrating Sphere
Colorimeter
Photometer
LED Test Instruments
Electronic Ballast Tester
Equipments for Testing Electronic components
Electrical Safety Tester
Environmental testing equipment
Spectrophotometer

Please visit our main website for detailed information ^_^

Growing Markets Requires the LED BLU Standards

Original Article: http://www.lisungroup.com/blog/led-blu-standards/
At IEC TC110 annual meeting of September, 2007, IEC made a formal decision to establish an independent the project team which is directly under the jurisdiction of IEC TC110, especially for the LED back light concerned by the  global industry,. In subsequent years, though the  unceasing expansion and development, it has possessed  many international standard projects such as he testing method, the general standard, points standard, terms and symbol.China is now one of the core members who had participated in the draft work of the international standard IEC TC110 / PT62595.Chinahas three experts who has taken in the draft work of LED back light international standards.
Growing market requires the LED BLU standards, which has been the hot topics in the industry.

Because LCD TV with LED back lighting 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 expands unceasingly. In recent years LED back light has become one of the main application direction of LED, and also the focus of the industries of mainland China,Taiwan,Hong Kong. According to J.P. Morgan ‘s data, in 2010, LED back light in the application of LCD TV will rapidly grow, the market penetration will increase up to 22% of 2010 from 3% of 2009,  and is expected to reach 56% in 2011.

Because the technology and industry such as the dynamic backlighting, sequential backlighting is still developing, standard has a huge impact on industry, so international standard of LED BLU have been the recent issues among Chinese, Japanese and south Korean industry.

About Lisun Group:
Lisun Electronics Inc. issued her 2012 version product catalog. Due to the LED industry developed this years, Lisun designed and produced a series high accuracy and high quality LED test instruments:
System of Goniophotometer (LSG-2000 or LSG-1800): This system is according to CIE, LM-79 & LM-80 and other lighting international standards. The customer can use it to measure light intensity distribution curve, export IES files for DiaLux software to re-design the lighting products. It is widely used in LED indoor and outdoor manufactory and lab design center.
Spectrophotometer (spektrofotometer) & Integrating Sphere Test System (LPCE-1): This system is suitable for photometric and colorimetric measurement of luminaries such as Energy-saving lamp, Fluorescent lamp, HID lamp (high voltage sodium lamp and high voltage mercury lamp), CCFL and LED. The measured data meets the requirements of CIE and IES_LM-79 for the measurement of photometry and colorimetry.
High and Low Temperature & Humidity Chamber (GDJS-*B): Different size can be chosen. It used for LED lamp test in high and low temperature condition to measure the quality.
Instruments for EMC Testing (EMC500 and ESD61000-5): The LED products sell to Europea are request CE certificate, the EMC Test Instruments are used to measure whether meet CE request.
AC and DC Power Supply: Different voltage and current Power supply can be chosen. It make sure the measuring lamp get a stably test condition on power supply.
Other important products: Integrating Sphere, Colorimeter, Photometer, LED Test Instruments,Spectrophotometer, Electronic Ballast Tester, Equipments for Testing Electronic components, Electrical Safety Tester,Environmental testing equipment.