LISUN LSG-1700 Rotation Luminaire Goniophotometer – After Sales Questions and Answers

LSG-1700 goniophotometer is an automatic goniophotometric instrument for luminous intensity distribution measurement with facility for rotating the light source. It is for industrial laboratory photometric data measurement of luminaires such as LED luminaires, HID luminaires, fluorescent lamps and so on.

Goniophotometer LSG 1700

IES file testing Goniophotometer Specification:

• Meets the requirements of CIE-70, IEC, IES LM-79, LM-80, EN13032-1 & GB standards
• Reaching many measurement ways C-Gamma

• The luminaries under test rotates around an angle of (γ)±180°(or 0-360°) and the luminaries rotates around itself with an angle of (C)±180°(or 0-360°)
• Luminosity testing range: Illuminance 0.001lx~10,000lx; Light Intensity 1.0cd～10^7cd (detector)
• The accuracy of angle: 0.2°
• Photometry accuracy: CIE Class 1
• Testing accuracy: 3%(Under Standard lamp); Stray Light: less than 0.2%
• English version software can run on Win7, Win8 or Win10, Win11

Q1: The power factor displayed in the electrical parameter table is negative.
A1: Please exchange and connect the wiring A1 A2 on the back of the electrical parameter table.

A1 A2 exchange connection

Q2: The total light flux test is inaccurate.
A2: Confirm the accuracy of the standard. (Refer to Chapter 3 of the user manual)

If the sample is an asymmetric light fixture, such as a street lamp, the angle spacing of ① C (B) should be set as small as possible, such as 5 degrees or 10 degrees. If the sample is a symmetrical lamp, such as an indoor lamp, the C (B) angle interval can be set slightly larger, such as 22.5 degrees or 30 degrees. In any case, the angle interval of ③ Gamma (Beta) should be 1 degree.

During C-Gamma testing, if the illumination angle of the sample lamp is greater than 180 degrees, the testing angle range of ④ Gamma needs to be set to 0 to 180 degrees.

Calibration parameters

Ensure that the temperature in the darkroom is around 25 degrees.
During the test, please confirm that the sample lamp is on and stable, and that all other lighting in the darkroom is turned off.
Please confirm that the darkroom is fully constructed and decorated according to the design drawings, and there are no reflective or leaking lights inside.

Q3: Abnormal shape of light intensity curve
A3: Please confirm that the installation direction of the luminous surface of the lamp is correct. If the direction is skewed, it will definitely lead to abnormal light intensity distribution curves.

The position of the luminous surface is correct

If the tested lamp is an asymmetric lamp, there may be different light intensity distribution curves for each C-angle of the sample. Different installation methods on fixtures will result in different light intensity curves.

Fixture position

Q4: Street lamp test curve abnormality
A4: Street lights have directionality, and if installed in the wrong direction, it may cause some test parameters such as the CU curve of the street light to be abnormal. The correct installation direction as shown in the figure, C0 direction, and the lamp pole of the street lamp should be facing directly upwards.

The lamp pole is facing straight up

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Integrating Sphere, Spectroradiometer, Surge Generator, ESD Simulator Guns, EMI Receiver, EMC Test Equipment, Electrical Safety Tester, Environmental Chamber, Temperature Chamber, Climate Chamber, Thermal Chamber, Salt Spray Test, Dust Test Chamber, Waterproof Test, RoHS Test (EDXRF), Glow Wire Test and Needle Flame Test.

Please feel free to contact us if you need any support.
Tech Dep: Service@Lisungroup.com, Cell/WhatsApp:+8615317907381
Sales Dep: Sales@Lisungroup.com, Cell/WhatsApp:+8618117273997