LED Tester | Christmas Light Tester - LISUN

LISUN engineer do installation & training in Mexico   In March 2017, LISUN engineer went to Mexico to do installation and training for customer. The customer purchased LSG-1800B High Precision Rotation Luminaire Goniophotometer from LISUN. LSG-1800B Goniophotometer is automatic goniophotometric instrument for luminous intensity distribution measurements with facility for turning the light source. The LSG-1800B use a constant temperature detector, Japanese Motor and Germany precision angle coder which keeps high test accuracy, you can learn more details at: http://www.lisungroup.com/product-id-339.html. Finally, we share some photos: [caption id="attachment_7950" align="alignnone" width="928"] Picture 1: LISUN engineer and customer are doing installation[/caption] [caption id="attachment_7951" align="alignnone" width="928"] Picture 2: Customer are operating the LSG-1800B Goniophotometer[/caption] [caption id="attach...

LISUN engineer visit Turkey do installation and training in February 2017   LISUN engineer Jacky went to Mexico to do installation&training taskIn February 2017. This customer purchased a set of LSG-1800B High Precision RotationLuminaire Goniophotometer and LPCE-2 CCD Spectroradiometer &Integrating Sphere Compact Test System from LISUN. The customer is very enthusiastic, they are satisfied with the installation and training, and Jacky had a nice trip here. Finally, we share some photos here: [caption id="attachment_7941" align="alignnone" width="800"] Picture 1: Jacky and customer have finished the installation of Goniophotometer[/caption] [caption id="attachment_7942" align="alignnone" width="800"] Picture 2: Jacky and customer have finished the installation of LPCE-2 Spectroradiometer & Integrating Sphere Test System[/caption] [caption id="attachment_7943" align="alignnone" width="800...

Installation & Training  in Brazil After doing  install and traning for EVERLIGHT INDUSTRIA E COMERCIO LTDA, Lisun engineer visit local another customer Studio XXI Metalurgica Eirelli and also provide the customer with install and training, this time they purchased LSG-1700B  high precision rotating luminaire goniophotometer . The visit went off successfully, as was to have been expected. Besides, With tremendous technical strength, honest services, reasonable price and good reputation, we have got high praise from the customer. Before the ending of the visiting in company, the customer said that they would purchase LISUN instruments if they still have other need later. For this visiting in Brazil, it  is meaningful and happy for our engineer. The following is some install & training photos at customer side: [caption id="attachment_7897" align="alignnone" width="600"] Figure 1: LSG-1700B high precision rotating luminaire goniophotometer[/caption] ...

There is a wide range of goniophotometers on sale in the market, including central rotation type, rotation mirror type, double mirror type and so on. How to choose the corresponding goniophotometers for the tested lamps becomes the most important problem for the users. This article makes a brief introduction to this knowledge based on LM-79 and EN 13032-1. A-α B-β and C-γ Co-ordinate System According to EN13032-1, no matter what kind of goniophotometers is used, the main measurement plane must be based on the picture below when measuring the light distribution performance of the luminaire 1.    First axis 2.    Second axis 3.    Third axis 4.    Photometric Center On this basis, the main coordinate systems used in the past are the following three: 1.    A-α：This coordinate system has not been used any more when testing conventional lamps and is only used to measure special lamps such a...

Our Engineer Went to Brazil to Install for our Customer After completing installation training in Mexico  in April 10 th   2017, our engineer went to the Brazil. In April 13, 2017, the Engineer arrived. This time we plan to visit our customer in Brazil which is named EVERLIGHT INDUSTRIA E COMERCIO LTDA. The company is also famous in local marketing. Ever Light products are found in shops specializing in lighting, strategically located in the main cities and towns, covering all regions of Brazil. They purchased LSG-1700B high precision rotating luminaire goniophotometer and LPCE-3 (LMS-7000VIS) CCD spectroradiometer integrating sphere compact system for LED from Lisun Group. Lisun Engineer visited their company, and help them to install the equipment, also gave a training course to them and teach them how to operate the instruments and etc. Below are some pictures. [caption id="attachment_7822" align="alignnone" width="800"] Figure 1: LSG-1700B High Preci...

The Role of Integrating Sphere Integrating Sphere plays the role in below three aspects. 1. Optical Receiver The measured light enters the sphere through the hole of integrating sphere. We set up one or two photo detectors on the inner wall such as selenium photovoltaic cells or photomultiplier tubes. The output light detector of the photo detector is proportional to the illuminance of the integrating sphere inner wall, which is proportional to the luminous that enters the integrating sphere. In this way, we could obtain the flux change of integrating sphere according to the change of output photocurrent. 2. Uniformly illuminated surface Several bulbs (usually four or six) are evenly arranged symmetrically on the inner wall of the integrating sphere. The light emitted by the bulb diffuses on the inner wall several times to form a uniform bright luminous sphere, which can be used as the uniform brightness, large field of view (2w>140 degrees) object surface (Optical system entrance ...

CIE Lighting Body and Standard Illuminant When you measure the photometric and chromaticity properties of optical system, it must be under the uniformly prescribed light source, the test result can be compared with each other. In order to unite the measurement standards, the International Commission on Illumination (CIE) provides the lighting body and standard illuminant. The definition of “illuminant” and “lighting body” by CIE separately: “illuminant” refers to a physical radiator that emits light such as lamps and sun. “Lighting body” refers to a specific relative spectral power distribution, which is not necessarily achieved by s specific light source, but it is given in a data table. CIE provides the spectral distribution of the “Standard Illuminant” and “Standard Lighting Body”. CIE standard lighting body A, B, C, E, D Standard lighting body A represents the complete radiator radiation at the absolute temperat...

What is Integrating Sphere? An integrating sphere is a hollow spherical cavity with its interior covered with a diffuse white reflective coating, which is also known as photometric sphere or flux sphere etc. There is one or several holes in the wall, which is used for light entrance hole and receiving hole to place light receiving devices. The inner wall of the integrating sphere should be a good spherical surface; it usually requires that the deviation from ideal spherical surface should not be larger than 0.2% of inside diameter. The inner wall of the sphere is coated with ideal diffuse material, which is the material with diffuse reflectance close to 1. The commonly used materials are MgO or BaSO4. Mix it with Glue Adhesive evenly and spray it on the inner wall. The spectral reflectance of MgO coating in the visible spectrum is above 99%. The light entering the integrating sphere is reflected by the inner wall coating multiple times to form uniform illumination on the inner wall. ...

IEC/EN62471 is the European Union's testing standards for laser products (including LED). IEC/EN 62471 is designed to evaluate the optical radiation hazards associated with different lamps and lamp systems. And it is also used to replace the IEC/EN60825 standards in the requirements of the LED product energy level. It increased the requirements of the optical biology, including radiation intensity, radiant brightness etc. This standard does the hazard classification according to the test data on the product, including the exemption level, low damage, medium hazard, and high hazard level. Among them, the EU part of the standard EN62471:2008 has been implemented in 2009.09.01, the LED part of EN60825 will be completely ineffective in 2010.09.01.   IEC/EN62471 Standard Background: 1.IEC/EN60825 is mainly for the single wavelength of the light energy testing; 2 IEC/EN62471 is mainly for the wide band of light measurement, and consider the time of eye and skin reacting to light, angle, ...