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illumia® Light Measurement Systems

Spectral Flux Measurement System

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  • Wide dynamic range which allows a single sphere to measure a wide range of light levels
  • NIST traceable standards for in-house recalibration
  • Spectral results in milliseconds
  • Spectraflect® interior sphere coating
  • Available in 25 cm, 50 cm, 100 cm, 165 cm, and 195 cm sphere diameters
  • Conforms to national standard measurement geometries

  • Total Spectral Flux
  • Luminous Flux
  • Radiant Flux
  • Chromaticity
  • CCT and CRI
  • Peak Wavelength
  • Dominant Wavelength
  • I, V, and Luminous Efficacy

  • Packaged LEDs
  • Miniature Lamps
  • LED Sourced Systems
Labsphere's series of illumia® Light Measurement Systems are the optimal choice for spectral flux measurement solutions. Featuring a wide range of high-end spectrometers, MtrX-SPEC software®, Labsphere light measurement spheres and lamp standards, illumia® Light Measurement Systems are configurable for all applications. 

Systems are available with sphere sizes of 25 cm, 50 cm, 100 cm, 165 cm, and 195 cm diameter to accommodate various device types and sizes. The systems can be expanded to include an auxiliary lamp for the correction of absorption error to ensure accurate test results. National Institute of Standards and Technology (NIST) traceable total spectral flux standards enable simple in-house system calibration and verification. The illumia® Light Measurement Systems are easily customized through a variety of interchangeable light measurement accessories.


The highly sensitive CDS-600 and CDS-610 mini CCD Array Spectrometers offer low noise and a broad spectral response with calibrated ranges from 200 to 850 nm or 350 to 1050 nm.

When coupled with a Labsphere integrating sphere, the spectrometers avoid the inherent photometric errors associated with filter-based photometers; data is accurate even for narrow-band light sources such as LEDs, fluorescent lamps, and discharge lamps.

In production, these systems can increase the throughput of quality assurance testing which facilitates improved statistical process control for higher manufacturing consistency and greater product quality.

CDS 6XX Datasheet

The CDS-1100 and CDS-2100 are based on the proven Crossed Czerny-Turner spectrograph with an electrically cooled back thinned CCD detector designed for efficient stray-light rejection.

These spectral engines include user activated integrated shutters for real-time dark correction and intuitive software modules for research, development and production.

When calibrated for the application with auxiliary hardware and MtrX-SPEC software, these multi-channel spectral analyzers provide rapid data acquisition for spectroradiometric, photopic, colorimetric, and electrical characteristics of the device under test (DUT).

CDS 1100 and 2100 Datasheet

Labsphere continues to set the standard in developing efficient test and measurement instruments for the lighting and LED industries with the introduction of the CDS-30x0 High Speed CCD array spectrometer series.

This best in class spectrometer series is designed to measure critical spectral and optical characteristics of devices with the greatest reliability, speed and accuracy for demanding manufacturing environments.

The fiberoptic connectors easily connect the CDS-30x0 series to a variety of measurement devices for both spectroradiometric and photometric measurement.

CDS 3XXX Spectrometers Datasheet


  • Environmentally and optically stable coatings
  • Provides high diffuse reflectance for applications in UV-VIS-NIR
  • IESNA LM-78, LM-79, and LM-80
  • Light-tight closure
  • Base-up or base-down lamp mounting
  • Socket mounting plate
  • Adjustable fluorescent lamp holder
  • Variable height electrical supply tube
  • Interchangeable baffles
  • Temperature sensor mounting port
  • Absorption correction lamp port
  • Absorption correction lamp baffle

Labsphere's illumia® Light Measurement Spheres are available in 25 cm, 50 cm, 100 cm, 165 cm, 195 cm and 4 m diameters. The sphere design complies with IESNA LM-78, LM-79 and LM-80 standards to deliver accurate and reproducible measurements.

The near lambertian properties of the sphere's interior coating, Spectraflect®, provides a uniform dispersion of light that integrates and reduces hotspots better than any other sphere coating available. Spectraflect® exhibits reflectance values up to 98% and is spectrally flat throughout the visible spectrum, therefore providing higher optical efficiency for low lumen lamps.

The three meter lamp measurement integrating sphere accommodates light sources positioned base-up, base-down or longitudinally to easily and efficiently measure virtually any lamp type, including fluorescent up to 2 meters in length. The design also allows for forward and partial flux measurement of test sources that are board-mounted or heat-sinked.

The larger sphere better integrates light for more reliable testing of a device's photometric and colorimetric performance with measurements of Total Spectral Flux, Luminous Flux, Correlated Color Temperature (CCT), Color Rendering Index (CRI) and Chromaticity.

For LM-79, Select the proper sphere size.

Omnidirectional - area of the light source not larger than 2% of the sphere

2pi measurement - opening of sphere should be less than 1/3 of the sphere diameter

Tubular - the size of the light source should be less than 2/3 of the sphere diameter


Auxiliary Lamps for Absorption Correction

Industry standards and Labsphere recommend applying absorption correction techniques. Self-absorption correction is critical, since the physical size and shape of SSL products and lamps under test are typically very different from the reference lamp size and shape. The use of an absorption correction lamp can correct for self-absorption errors.

Lamp assemblies mount onto a Labsphere 1-inch port frame and auxiliary lamp port on Labsphere light measurement spheres with no modifications required.

Calibrated Lamp Standards

Labsphere's Total Spectral and Total Luminous Flux Lamp Standards are selected for their stability and reproducibility. Each lamp has been carefully screened, seasoned, and calibrated in our Optical Calibration Laboratory under the guidelines recommended by the IESNA (Illuminating Engineering Society of North America) to provide the highest degree of accuracy. A calibration certificate verifying traceability to NIST is provided with each lamp.

Calibrated Forward Flux Standards

Labsphere's Lamp Standards of Total Spectral Flux provide an exceptional artifact for calibrating integrating sphere spectrometers for total spectral radiant flux responsivity from 350 nm to 1050 nm. Labsphere's Lamp Standards of Forward Spectral Flux are selected for their stability and reproducibility. The selected lamps are then calibrated directly to the NIST lumen, for a calibration result you can rely on.

The MtrX-SPEC® software module is the most intuitive platform for calibrating and analyzing spectral radiometric, photometric, and colorimetric properties of light sources ranging from simple lamps and LEDs to solid state lighting assemblies and traditional indoor and outdoor lighting systems. Need to track life or performance over time? Want to know how the dominant wavelength shifts with operation? The MtrX-SPEC® temporal feature allows you to monitor optical and electrical performance versus elapsed operating time.

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