GL Gonio Spectrometer GLG 2-300

Benchtop light goniometer for small LED lamps and modules

Benchtop Light Goniometer

Automated Light Intensity Distribution and Flux

GL Optic’s latest innovative product combines the functionality of a goniophotometer with the features of a spectroradiometer to measure flux and to check angle dependence luminous intensity together with the colorimetric data required by international standards.

The new GLG-2-300 is a table top light goniometer specifically designed for LED modules and component testing. This setup can also be used for smaller lamp measurements. The automated, PC based system can hold devices up to 2-3kg and 300mm diameter and measures with an angular resolution of 0.1° and C-plane and λ angle +/- 180°. It is truly a universal spectral light measurement solution for a range applications.

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Speed Up Your Development

Don’t let the size fool you. This benchtop goniophotometer system can be used for performance evaluation of LED modules, optical components and electrical components at all points during development. This highly automated system holds devices up to 2-3 kg and 300mm diameter allows every company to get accurate and reliable measurements in minutes instead of days or weeks when outsourcing to external labs.

Check Your Color uniformity

According to the new CIE S025/E:2015 u’, v’ color coordinates should be measured using goniospectroradiometer in the vertical angle range of 10° or less (recommended 2.5°) and the horizontal angle range of 90° or less (recommended 22.5°). Angular Color Uniformity value is measured as the largest deviation of chromaticity (u’,v’) of LED device emitted in different directions from averaged chromaticity (u’a, v’a).

LED Product Compliance

This automatic optical goniometer instrument was designed as a universal LED measurement solution and is compliant with new CIE S025/E:2015 for LED modules, lamps and luminaires. It also meets the requirements of the IES LM-79 standard. The system provides data and reporting required by American Energy Star and European Eco-Design requirements for LED lighting.

GLG 2-300 Light Goniometer Usage

Build Your Competitive Advantage

LED lighting has become more and more competitive and the available technology and components are changing fast. Developing and evaluating new models of modules and lamps is a constant challenge for manufacturers and importers. Our fully automated, compact light goniometer instrument supports development teams and product testing labs who need to measure the light intensity distribution of LED products.

A large, expensive laboratory isn’t necessary if you want to measure smaller products and components. The GL Gonio Spectrometer GLG 2-300 can be used in a small dark room or even in a dedicated measurement station and deliver professional photometric and colorimetric characterization of LEDs. It comes complete with a spectroradiometer and a user friendly analytical software. Start testing your own products and build your competitive advantage based on quality and knowledge.

Detailed Tests and Reports

The majority of goniophotometers on the market require highly trained and experienced technicians to deliver the results you need. The GLG 2-300 gonio was designed to bring the capability to every company and purpose built as a practical, everyday solution for engineers and technicans. The plug-and-play nature of the system simplifies the complex measurement procedures. Simply install the lamp on the mechanical board, align it with the available laser alignment tool, set parameters and you are set to measure the intensity distribution! The system automatically rotates and measures the DUT at each location, and then the results output into a completely customizable report.

Photometric Files and More

Light intensity distribution diagrams and luminous flux together with IES and LTD photometric files are automatically generated by the system. Since we use a spectroradiometer as the default detector, the light gonio generates all colorimetric values like CCT and Duv, CRI and Rf (TM-30 2015) MacAdam Elypses, Angular Colour Uniformity and more. This is simply not available in standard goniophotometer systems for light measurement.

GLG_2-300 Light Goniometer Features


  • C type optical goniometer in C-γ coordinate
  • Optical axis in horizontal direction
  • Angular luminous intensity measurements
  • Luminous flux measurements
  • EULUMDAT and IES file generation


  • Class A laboratory photometer
  • Current or power sources and power meter
  • TEC Control or temperature measurement

GLG 2-300 Metrics

Photometric Quantities

  • Light Intensity Distribution
  • Polar Diagram
  • Cone Diagram
  • Luminous flux
  • IES and LTD file formats
  • Centre Beam Intensity

Colorimetric Quantities

  • Correlated Colour Temperature (White LED Light Sources) CCT and Duv
  • Colour Rendering Indices (White LED Light Sources) Ra, CRI, R1 to R14, IES TM-30 2015
  • MacAdam Ellipses
  • Angular Color Uniformity

Additional / Optional

  • Luminous Efficacy [lm/w]
  • Power factor (i.e. cos θ)
  • Temperature

GLG 2-300 Specifications

CIE Goniometer type Far Field Type C with horizontal optical axis
DUT moving;
2 axis stepper motors;
Belt drive system
Angular range C axis ± 180°
Angular range γ axis ± 180° theoretical (usable depending on geometry due to shadowing)
Angular positioning precision 0.1°
Reproducibility C axis 0.1°
Reproducibility γ axis 0.1°
Angular speed C axis up to 45°/s
Angular speed γ axis up to 45°/s
DUT photometric center positioning 0 to 170 mm
via hand crank
Photometric distance 1.5 m – 4.5 m
Distance >= largest DUT dimension x (5 to 
DUT mounting plate
(bread board)
Square 80 x 80 mm;
Multiple M6 mounting holes
Maximum DUT dimension ≤ 300 mm (diameter or diagonal)
Goniometer dimensions 530(L) x 400(W) x 345(H)mm
Maximum operating footprint diameter 1100 mm
(when vertical axis is fully extended)
Maximum load 2 kg
Goniometer weight 5.5 kg
Power supply and max. consumption PC connection by USB A-B;
110-230 V; 40W
Sensor type GL Optic Spectrometer range:
GL Spectis 1.0;
GL Spectis 1.0 Touch;
GL Spectis 5.0 Touch;

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