Comparison of vertical goniophotometer and horizontal goniophotometer

The goniophotometer is mainly used to measure the light distribution performance of lamps and light sources. That is, the luminosity and chromaticity value distribution of the laser source of lamps in different directions in space.

1. What are the main types of goniophotometers and what are the test methods?
1.1 Types of goniophotometer
Goniophotometers are mainly divided into two types: horizontal and vertical. It is mainly used to test the lumen, light distribution curve, glare level, and isoilluminance distribution diagram of the whole lamp. In addition, one of the most important functions is to export IES or LDT files. (The goniophotometer system can also add a spectrometer and a color probe to form a system for measuring the spatial spectral distribution.)

1.2 Test method of goniophotometer
A curve drawn according to the candela values of the light source at different positions in the space can reflect the performance of the light source to a certain extent. Lamps, street lamps, etc. It is the most widely used test method at present. That is, the test method based on the B-β coordinate system is used for the test of floodlights in most cases. For details, please refer to the CIE-127 test standard. That is, the A-α coordinate system is not based on the test method, which is suitable for the test of traffic lights, fairway lights, and signal lights.

2. What are the standards and test principle that the vertical goniophotometer and the horizontal goniophotometer required?
2.1 Vertical goniophotometer fully meet standard below:
LSG-6000 Moving Detector Goniophotometer (Mirror Type C) completely meets LM-79-19, IES LM-80-08, COMMISSION DELEGATED REGULATION (EU) 2019/2015, CIE-121, CIE S025, SASO 2902, IS16106 and EN13032-1 clause 6.1.1.3 type 4 requirements. LSG-6000 is the latest upgraded product of LSG-5000 and LSG-3000 in compliance with the requirements of the LM-79-19 standard, its an automatic light distribution intensity 3D curve testing system for measuring light. The measuring distance is from 5m to 30m.

Test principle (Vertical Type)

Test principle(Vertical Type)

2.2 Horizontal goniophotometer fully meet the below standard:
Full meet the EN13032-1 clause 6.1.1.3 goniophotometer type 1, COMMISSION DELEGATED REGULATION (EU) 2019/2015, CIE-70, CIE-121, IES LM-79, IES LM-75, IES LM-80 and ect.

Test principle (Horizontal Type)

3. What are the technical configurations of the vertical goniophotometer and the horizontal goniophotometer?
3.1 Vertical goniophotometer technical configuration:
• The luminaire under test rotates around the mirror with an angle of (γ) vertical axis ±180° (or 0-360°) and the luminaire rotates around itself with an angle of (C) horizontal axis ±180° (or 0-360° ).
• The accuracy of angle: 0.05°, Resolution of angle: 0.001°
• Accuracy of Goniophotometry detector: Constant temperature photo detector DIN5032-6/CIE pub1. No. 69 Class L
• LISUN goniophotometer software can export CIE, IES, LDT and other format files. These kinds of format files can be used via other illumination and luminaire design software such as DiaLux.
• Connect the goniophotometer to PC via USB cable. English version software can run on Win7, Win8 or Win10, Win11
• LSG-6000 can be used together with a CCD Spectroradiometer to test spatial CCT Distribution and other Spectral color parameters. We call this system “Goniospectroradiometer (LSG-6000CCD)”. LSG-6000CCD Goniospectroradiometer = LSG-6000 Goniophotometer System  +  LPCE-2 Integrating sphere Spectroradiometer System. Please click to download the LSG-6000CCD Brochure
• The LSG-6000CCD software and hardware support the plant lighting PAR, PPF and PPFD spatial distribution test , and it can export IES/LDT files

3.2 Horizontal goniophotometer technical configuration:
• With a constant temperature detector, Japanese motor and German precision angle coder which keep the test results with high accuracy
• The goniophotometric instrument can do the B-β test with two pillars and the C-γ test with single pillar & multi-function jigs
• Test Max Luminaires size and weight: LSG-1890B is 2000mm/60kg and LSG-1800A is 1600mm/50kg
• The tested luminaries rotates around an angle of (γ)±180°(or 0-360°) and the tested luminaries rotates around itself with an angle of (C)±180°(or 0-360°)
• Luminosity Testing Range: Illuminance 0.01lx~99,999lx; Light Intensity 1.0cd～10^⁷cd (detector)
• Angle accuracy: LSG-1890B is 0.1°, LSG-1800A is 0.2°
• Photometry Accuracy: CIE Class A (Class L is option)
• Testing Accuracy: 2%(Under Standard lamp); Stray Light: less than 0.1%
• English version software can run in Win7, Win8 or Win10, Win11
• LSG-1890BCCD/LSG-1800ACCD Goniospectroradiometer=LSG-1890B/LSG-1800A Goniophotometer System + LPCE-2 Integrating sphere Spectroradiometer System
• LISUN goniophotometer software can export CIE, IES, LDT and other format files. These kinds of format files can be transferred by other illumination and luminaire design software such as DiaLux

4. What are the laboratory requirements for vertical and horizontal goniophotometers?
4.1 The laboratory requirements for vertical goniophotometers are as follows:

LSG-6000 series darkroom requirement

LSG-6000CCD series darkroom requirement

LSG-6000 goniophotometer drawing

Note: E is the max diameter of the testing lamp. Depeonds on the darkroom size, the max diameter of the light-emitting area will be about 200mm less and the thickness F will also be less accordingly.
• The dark room wall, ceiling and floor should be all coated with dull black paint or be covered by black cloth and black carpet.
• Air-conditioner: be set in the dark room to control the temperature around lamps to the standard value upon the CIE requirements.

Note: LISUN GROUP engineer dept will submit the Lab Design support documents according to the customer’s real lab size after the formal purchase order was confirmed. NOTE: The longer dark room, the better test accuracy. LISUN recommends you to prepare as longer dark room as you can (max 30m).

4.2 The laboratory requirements for horizontal goniophotometers are as follows:

LSG-1890/LSG-1800A goniophotometer darkroom requirement

LSG-1890BCCD/LSG-1800ACCD goniospectroradiometer darkroom requirement

Horizontal goniophotometer drawing

• Dark Room size request (The G, A and E please refer to the above table 1 and figure 1 and 2): The darkroom Width W=G+X (It recommends the X is min 500mm which can allow one person pass). The darkroom Height H=A+0.5*E+Y (It recommends the Y is min 100mm to the ceiling). The darkroom Length L=6*E (According to CIE, it requests at least 6times than the testing lamps).
• Control Room size request: min=2000*2000*2000mm
• The wall, ceiling and floor should be all coated with dull black paint or be covered by black cloth and black carpet.
• Air-conditioner should be set in the dark room to control the temperature around lamps to the standard value upon the CIE requirements
• LISUN engineer dept will submit the Lab Design support documents according to the customer’s lab size after the purchase order was confirmed.

NOTE: The longer dark room, the better test accuracy. LISUN recommends you to prepare as longer dark room as you can (max 30m).

5. What is the customer base of vertical and horizontal goniophotometers?
5.1 Customer groups of vertical goniophotometer:
The vertical goniophotometer fully meets the IESNALM-79 requirements for Type-C distribution photometer, and is recommended in the CIE T0 document. Therefore, most third-party testing institutions, large national laboratories, customs, etc. will choose LM-79 Moving Detector Goniophotometer (Mirror Type C).

LM-79 Moving Detector Goniophotometer (Mirror Type C) 

Customer lab who purchase vertical goniophotometer

5.2 Customer groups of horizontal goniophotometer:
The horizontal goniophotometer has been widely used by enterprises due to its high cost performance and can meet the testing requirements of most production LED factory and small laboratories who not required for highest test accuracy and budget is not enough. You can consider LISUN High Precision Rotation Luminaire Goniophotometer.

LSG-1890B goniophotometer

Customer lab who purchase horizontal goniophotometer

6. What are the test reports of the vertical and horizontal goniophotometers?
6.1 Vertical goniophotometer test report:

LSG-6000 Test report

6.2 Horizontal goniophotometer test report:

LSG-1890B Test Report

Summarize:
No matter what type goniophotometer you will choose, they can test Luminous Intensity Data, Photometric Data, Luminous Intensity Distribution, Zonal Luminous Flux, Luminaries Efficiency, Luminance Distribution, Coefficient Of Utilization, Luminance Limitation Curves Glare, Maximum Ratio of Distance to Height, Equal Illuminance Diagrams, Curves of Luminaires VS Lighting Area, Isocandela Diagrams, Efficient Luminescence Angle, EEI, UGR, etc. You can choose one according to your test accuracy requirement and budget.

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.

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