LISUN engineer do installation & training in Mexico

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="attachment_7952" align="alignnone" width="800"] Picture 3: LISUN engineer (Left first) and the Customer[/caption]

 

 

LISUN engineer visit Turkey do installation and training in February 2017

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"] Picture 3: Jack is doing training for them[/caption]

[caption id="attachment_7944" align="alignnone" width="800"] Picture 4: Customer are practicing the operation[/caption]

Installation & Training in Brazil

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]

 

 

How to choose the right goniophotometer according to the standard LM-79 and EN13032-1？

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 as traffic, channel lights and indicator lights. Do not introduce it here. (Lisun LSG-1950 Goniophotometer for automotive and traffic signal lamps is specially designed according to this coordinate system)
2.    B-β：It is still used, but mainly for testing spot lights.
3.    C-γ：At present, it is recommended by the international standard which can guarantee the accuracy of the test at utmost.

B-β coordinate system
The schematic diagram is as follows：


1.    First axis
2.    Pole axis
3.    Third axis
4.    B Panel

• The first axis of the luminaire passes through the photometric center and is perpendicular to the B plane, which is also the main light emitting surface of the luminaire. The luminaire is measured by a photometric probe when revolving around the third axis and the polar axis.
• For non flood light, if you use the B-β test, the reference axis of the lamp need be taken as the third axis above, while the main light emitting surface is facing the probe, which means the probe is located on the first axis.

C-γ coordinate system
The schematic diagram is as follows：



1.    First axis (Pole axis)
2.    Second axis
3.    Third axis
4.    C panel

• The polar axis rotates on the C plane, while the C plane rotates around the polar axis. The photometric probe is located on the third axis
• When the lamp is still, the light emitting surface of the luminaire must be facing the probe, i.e., both of them are located on the third axis. If they are inconsistent and inclined, it need to be explained.
• The test results of C and B coordinate system can be calculated and swap. Lisun’s LSG-1800B/LSG-5000/LSG-2000 provides two special test fixtures and can also direct conversion in software.

 

LISUN Goniophotometers Detailed Characteristics

The Goniophotometer is based on these two coordinate systems to carry the test, especially the use of C- gamma coordinate system products occupy most of the market. Based on this coordinate system, a variety of Goniophotometer with different working principles are derived.

1. Goniophotometer with Moving Mirror and Moving detector

LSG-5000 Moving Detector Goniophotometer fully meets LM-79 Clause 9.3.1 request. The tested lamp will keep burning position and be fixed. Near field detector, the lamp and the mirror are in the same line. During the test, the near field detector and the mirror will circle around the lamp, and the far field detector will rotate synchronously with the mirror.


• The instrument needs to be used in the darkroom, and the darkroom is equipped with diaphragms and light traps to reduce stray light and ensure the accuracy of the test
• According to the LM-79 standard, the color distribution test should be carried out while the photometric test is carried out. The user can select the color detector at the time of purchase, and test the color directly.

2. Goniophotometer with Moving Mirror

LSG-2000 Goniophotometer with Moving Mirror can test luminaries rotating in the prescribed burning position and around the vertical axle and a reflecting mirror rotates around the horizontal axle, meanwhile, a synchronous axle will rotate toward the opposite direction synchronously, so the luminous intensity has no change. Using the C-γ coordinate system to carry the test and comparing with the Moving Mirror and Detector Goniophotometer above, the difference is the lamp will rotate with the movement of the mirror synchronously and lower accuracy than Moving Mirror and Detector Goniophotometer.


• Meets the test requirements of C-γof LM-79 and EN13032-1 standards and has higher accuracy for LED lamp.
• Meets the test principle of CIE-70-1987 7.3 for goniophotometer.
• Needs to be used in the darkroom, and the darkroom is equipped with diaphragms and light traps to reduce stray light and ensure the accuracy of the test
• According to the LM-79 standard, the color distribution test should be carried out while the photometric test is carried out. The user can select the color detector at the time of purchase, and test the color directly.

3. Central Rotation Goniophotometer (horizontal)

LSG-1800B high precision ratation luminaire goniophotometer system carries out measuring methods of fixed location and rotating luminaires. The measured luminaire is installed on the rotating supported, the center of which is in line with the rotating supporter center. The fixed photometry detector is testing the luminous intensity in various horizontal directions, while the light source rotating. The mechanical equipment allows turning the tested luminaires around a vertical axis and a horizontal axis. When tested luminaires turn around horizontal axis, the detector which is at the same level with rotating table will measure the intensity of each direction at this surface. When rotating with vertical axis, the detector will measure the intensity at the vertical surface.

This goniophotometer system has fast test speed, low requirement of darkroom, simple installation and maintenance, and high test accuracy for LED lamp. But for parts of the gas discharge lamp (such as fluorescent lamps, halogen lamps, etc.) because the lamp cannot be fixed in the lamp position, the accuracy will be lower than the two goniophotometer above. It is usually used to carry the factory inspection.


• Meets the test requirements of C-γof LM-79 and EN13032-1 standards and has higher accuracy for LED lamp.
• Needs to be used in the darkroom, and the darkroom is equipped with diaphragms and light traps to reduce stray light and ensure the accuracy of the test
• According to the LM-79 standard, the color distribution test should be carried out while the photometric test is carried out. The user can select the color detector at the time of purchase, and test the color directly.

3. Goniophotometer with color detector

There are two different ways to test the colorimetric parameters according to the descriptions of LM-79 part 12:
1.    Get the average value of the colorimetric parameters of the sample in space directly via measuring by an integrating sphere spectroradiometer system.
2.    Get the colorimetric parameters of each angle in space via adding a color detector to the goniophotometer system in the darkroom. We call the whole system "Goniospectroradiometer". When second measuring methods are used, the interval and range of the detector scan should be consistent with the photometric measurements. The specific parameters can be seen in LM-79 9.3.3.
LSG-5000CCD moving detector goniospectroradiometer. The color detector is together with the near field photo detector.
LSG-2000CCD goniospectroradiometer with ratationg mirror. The color detector is in the dark room.
LSG-1800BCCD high precision rotation luminaire goniospectroradiometer. The color detector is in the dark room.

• The principle of these type goniophotometers is adding a color detector and a spectroradiometer in the darkroom to the coaxial axis of the photometric detector to carry the test.
• IF the color detector of LSG-5000CCD is installed in the near field, it can carry the test directly.

Conclusions

From the above, we can conclude that when selecting the goniophotometer, the following principles need to be followed:
1.    In addition to automobile lights and traffic lights, try to choose the C-γ coordinate system goniophotometer. ( LSG-1800B/LSG-2000/LSG-5000 can carry the test of C-γ and B-β )
2.    To get higher test accuracy, try to choose the rotation mirror and rotation detector goniophotometer or rotation mirror goniophotometer. (LSG-5000/LSG-2000, in the case of insufficient budget and testing the LED luminaire, horizontal goniophotometer can also be selected)
3.    The length of the darkroom (length of light path) shall be guaranteed at least 6 times longer than the longest axis of the luminaire to be measured.
4.    If need to test the spatial color distribution, the darkroom should be equipped with a special spectroradiometer and a corresponding color detector. (LSG-1800BCCD/LSG-2000CCD/LSG-5000CCD meets all requirements)

At present,there are other types of goniophotometer on the market such as double rotation mirror goniophotometer. Although it can shorten the length of the darkroom, but the mirror can't reflect the light by 100%. Adding one mirror also can increase the test error and the angle between the mirrors should be strictly controlled, otherwise easy to affect the final test results.There are some near field rotation detector goniophotometers. Because of the limit of distance, they cannot test larger size of lamp. At the same time because there is no light trap and light bar, once the darkroom is broken, it could have an impact on the test results. There also is a limit of occasion.
Lisun develops the LSG-1800B/LSG-1800BCCD horizontal goniophotometer, LSG-2000/LSG-2000CCD rotation mirror goniophotometer, LSG-5000/LSG-5000CCD rotation mirror & rotation detector goniophotometer according to years experience of research and development in the field of optical detection equipment, according to the different needs of customers, according to different application environments. Win the favor of large numbers of customers in the domestic and foreign markets. While providing the best cost-effective products, Lisun also ensure a high test accuracy and timely after-sales service.

Our Engineer Went to Brazil to Install for our Customer

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 Precision Rotating Luminaire Goniophotometer[/caption]



Figure 2: LPCE-3 (LMS-7000VIS) CCD Spectroradiometer Integrating Sphere Compact System for LED

The Role of Integrating Sphere

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 pupil and the exit hole is basically coincident) of the measured optical system. The integrating sphere is used to measure the vignetting coefficient of the photographic objective lens and the uniformity measurement of the illuminance of image plane.
3. Spherical parallel light tube

Open two holes at the horizontal axis at both ends of the sphere. One hole is fitted with a collimating objective lens, and the focal length of the collimating objective lens is equal to the inner diameter of the sphere. Symmetrically set a few bubs with horizontal axis in the vicinity of the objective lens on the side of the sphere, the light emitted by the bulbs can’t hit directly the objective lens. The other hole is fitted with a stopper with a central opening, and a horned extinction tube with a black absorbing layer on the inner wall is inserted so that the light entering the extinction tube through the stopper hole is completely absorbed.

Thus, the stopper with hole and the extinction tube form a bold body, so that the sphere will simulate a black object in the bright sky for the collimator. Remove the stopper with hole and the extinction tube, put the white stopper and the sphere will simulate a uniform brightness sky. The integrating sphere with collimating objective lens, bulb and black and white stopper is called the spherical parallel light tube, which is used to measure the stray light coefficient of the telephoto coefficient. During the measurement, the illuminance of the blackbody target image and the “white stopper” image are measured by the photo detector. We could obtain the stray light coefficient of the measured telescope after calculation the corresponding indication value measured by the photo detector. If the image is not total black when the telescope images the black target in the bright sky, then there is some stray light to the image plane except the telescope images the target.

CIE Lighting Body and Standard Illuminant

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 temperature of 2856K(1990 International practical temperature scale). Its chromaticity coordinates is in the black body track on the chromaticity diagram of CIE1931.
Standard lighting body B represents the direct sunlight at the color temperature 4874K, its light color is equivalent to the sun at noon, its chromaticity coordinates is close to the black body track.
Standard lighting body C represents the average daylight at the color temperature 6774K. Its light color is similar to the cloudy sky light, its chromaticity coordinates is below the black body track.

Standard lighting body E is the lighting body with constant value of spectral power during the visible light range, which is also known as equal-energy spectrum or equal-energy white. It is a human-defined relative spectral power distribution, which does not exist in practice.
Standard lighting body D represents the relative spectral distribution of the natural daylight, which is also called typical daylight or reconstructed daylight. Typical daylight and the actual daylight have a very similar relative spectral power distribution, which is more in line with the chromaticity coordinates of daylight than the standard lighting body B and C. The spectral power distribution of the lighting body D at any correlated color temperature can be obtained by the formula, but for practical use, CIE recommends several specific relative spectral power distributions in the standard lighting body D as the standard daylight when calculate and measure photometric and chroma. They are separately CIE standard lighting body D65, D55 and D75, the represented the relevant color temperature are separately 6504K, 5503K and 7504K. CIE stipulates that we should use the CIE standard lighting body D65 to represent daylight if possible, D55 and D75 can be applied when D65 can’t be used.
CIE Standard Illuminant A, B, C, D65

Standard Illuminant A The standard lighting body A is realized by a transparent glass inflatable tungsten lamp with a color temperature of 2856K as A light source. If it is required to accurately simulate the relative spectral power distribution of the UV portion, then a fused silica glass shell or a bulb with a quartz window is recommended.
Standard Illuminant B, C Standard light source A and a corresponding set of specific Davis-Gibson liquid filters to reach standard lighting body B and C.
Corresponding to the standard lighting body D, CIE has not recommended the corresponding standard light source, so the standard lighting body D simulation has become one of the important topics of current light source research. Currently the developed artificial light source of analog D65 standard lighting body: high-pressure xenon lamp with a filter, incandescent with filter and fluorescent lamps with filters; the best simulation effect of D65 Illuminant is the high-pressure xenon lamp with a filter.

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. In order to obtain higher measurement accuracy, the aperture of integrating sphere should as small as possible. The aperture ratio is defined as the ratio of the sphere area at the opening of integrating sphere to the area of the sphere total inner wall.

EN62471 Light Bio Safety Testing Standards

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, sensitivity and other aspect to do the calculation.

 

IIEC/EN62471 Applicable Products: all the lights and lights system except laser. (single wavelength laser is easy to test, the ordinary lamp may be a wide band light source because of the influence of light emitting body and diffuser, lens, optical components and other devices.)

 

IEC/EN62471 Wavelength range of testing: 3000nm-200nm optical radiation

 

IEC/EN62471 Parameters and Test object:

Parameters

1 Irradiance (radiation flux divided by the area of the unit, unit: W? M-2)

2 Radiance (irradiance divided by the field, can be converted through irradiance)

Test object

1 The ultraviolet harm of skin and eyes

2.Near UV hazard (315nm-400nm) of eyes

3 Retina blue light hazard

4 Retina blue light hazard (light source)

5 Retinal thermal hazard

6 Retinal thermal hazard (for weak visual stimuli) (780nm-1400nm)

7 Infrared radiation hazard of eyes (780nm-3000nm)

8 Skin heat hazard (380nm-3000nm)

 

Judgment of results

1. Continuous Light: no danger; 1 level danger (low risk); 2 level danger (Intermediate risk); 3 level dangerous (high risk)


2. Pulse Light: 1. If exceed radiation limits, then in accordance with the 3 level danger; 2 The single pulse no exceed radiation limits in accordance with no danger; 3 The multi pulse light no exceed radiation limits in accordance with continuous lamp classification method.

 

Lisun developed IEC62471/EN62471-A LED optical radiation measurement system can apply in the general measurement of optical radiation safety in accordance with the requirements of IEC-CTL and the IEC62471 for laboratory. Lisun Electronic (Shanghai) office is committed to the development and after-sales maintenance of lighting instrument, EMI / EMC testing system and safety testing instruments in the domestic and global market. The full range of products of Lisun are in strict accordance with the quality management and control of ISO9001:2008 requirements for R & D and production; Lisun is also the member unit of global lighting CIE association, all products are according to CIE requirements; in addition, all products of Lisun are certified by CE and get the qualification of the EU.