Integrated tabletop solution for luminous flux and radiant power measurement of LEDs.

gl opti sphere 205 integrating sphere

Luminous flux & radiant power measurement of LEDs

GL OPTI SPHERE 205 small integrating sphere offers an automated, easy to use alternative for measuring luminous flux and radiant power of LEDs and other small light sources. All measurements are compliant with the recommendation of the CIE Technical Committee published in the CIE 127:2007 Technical Report.
The intelligent design of the GL OPTI SPHERE enables different adapters to be installed and allow measurement of a wide number of light sources. Front emitting diodes conforming to CIE recommendations can be measured at the wall entrance in 2π geometry. Other types of LEDs should be measured at the center of the sphere in 4π geometry. Configure the system as required by your application.

Flexible and expandable

Choose from a range of spectrometers, use SMA fiber optics or direct connections plus measure 2π or 4π. These are just a few of the hardware options available. Extend your capabilities even further with any one of our powerful software analysis and automation tools.

Fast and accurate

Designed as a tool for everyday use, the GL OPTI SPHERE 205 offers a great alternative to external labs or old technology devices. Get laboratory level color and radiometric accuracy in an instant on your desk, in your lab or on the production line.

Simplicity in design

The integration system design of the GL OPTI SPHERE allows users to obtain all light properties at the click of a button. Say goodbye to complex hardware and software, and take control of your optical development. 


Simplified luminous flux

GL OPTI SPHERE 205 was developed to simplify light measurement for single LED’s and small LED modules. Traditional systems are challenging to use, often sensitive to small physical changes and unintuitive software that make it difficult to obtain consistent results independent of the user. With peripheral integration, automated sequences are possible and make this issue a thing of the past.

Reliable measurement of light

Inner walls of the sphere are coated with barium sulfate (BaSO4) which ensures high reflectance properties up to 97%. All GL Optic spheres are universal and can be used with any GL SPECTIS series spectrometer with a corresponding adapter installed directly on the sphere or via an SMA fiber-optic cable.

GL OPTI SPHERE 205 Features

Precisely designed aperture

The port of the sphere is equipped with a precisely designed 50mm aperture which can be used in partial flux measurements of LEDs. For this application, the test LED is installed outside the sphere at a defined distance and the flux is measured inside the sphere.

CIE compliant

Measurement of LEDs compliant with CIE 127:2007 and new CIE S 025/E:2015. This sphere also complies with other global standards and all American IES LM and European EN requirements for professional LED light measurement instrumentation.

Useful accessories

Appropriate accessories are available for specific measurement purposes. GL OPTI SPHERE 205 features an auxiliary light source to compensate the self-absorption effect of the test LED.

Automated self-absorbance correction

The integrated LED auxiliary light source is fully controlled by the GL SPECTROSOFT software to enable quick corrections and deliver optimal results.

GL OPTI SPHERE 205 Metrics

Integrated quantities

  • Total luminous flux [ lm ]
  • Radiant power [ W/nm ]
  • Total photon flux
  • PBAR and more.

Colorimetric quantities

  • Correlated color temperature – CCT and Duv
  • Color rendering indices – Ra, CRI, R1 to R14, TM-30
  • Fidelity index Rf
  • MacAdam elypses.
  • Binning
  • Color coordinates

Optional quantities*

  • Luminous Efficacy [lm/w]
  • Power Factor
  • *require optional peripheral devices please inquire here

    GL OPTI SPHERE 205 Specifications

    Luminous flux and radiant power measurement of LEDs and other light sources.
    Spectral range*340 – 1700 nm
    Sphere inner diameter205 mm
    Entrance aperture diameter50 mm
    Sphere materialAluminium
    Inner coatingBarium Sulfate (BaSO4) high-reflectance material (R98)
    Outer coatingBlack textured finish
    Reflectance properties97%
    Auxiliary light sourceWhite LED
    Spectrometer portDirect connection or SMA fiber-optic
    Standards complianceCE, LM 79, CIE 127:2007 CIE S 025/E:2015
    Maximum DUT dimensions in accordance with CIE S 025/E:201520 mm (diameter or diagonal)
    Maximum dimension for optimal measurement (1/3 x sphere diameter)65 mm (diameter or diagonal)
    Maximum DUT weight250 g
    Sphere frameN/A
    Sphere center positioningN/A
    Mechanical breadboard with postFor 4π measurement
    USB source controller for auxiliary light sourceWith current source and relay switch for external power supply
    Universal post with standard lamp socketsN/A
    External dimensions [W x H x D]264 mm x 277 mm x 223 mm
    Weight3,3 kg
    * Spectral range of the sensor. Actual spectral range of system may be reduced due to limitations of used optical accessory.
    Note: Instrument, firmware and software specification are subject to change without prior notice. All information included in GL OPTIC datasheets and product information available in any form are carefully prepared and included information believed to be true. Please note that discrepancies may occur due to text and/or other errors or changes in the available technology. We advise to contact GL Optic before the use of the product to obtain the latest product specification.
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