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SpectroRadiometers- LED Measurement Systems

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LED Measurement Features  Onlineshop

  • Measure LED optical output in Luminous & Radiant Flux, spectral irradiance and LUX, microwatts/cm2, moles per second, PAR, Footcandles, CRI & CQS
  • LED Measurement Systems include a miniature spectrometer, a fiber optic cable (or direct attachment), a light collecting accessory/integrating sphere, and a NIST traceable intensity calibration
  • Real-time 1931 CIE Chromaticity diagram for xy Chromaticity, Dominant Wavelength, Purity, and Correlated Color Temperature (CCT)
  • LED Testing spectrometers available to cover the 200-1700nm range
led measurement

Typical System consists of a BLUE-Wave VIS spectrometer, F600 fiber optic cable, a 6″ integrating sphere, and a Radiant Flux Calibration for absolute intensity in Watts/nm

More and more incandescent lights are being replaced by LEDs each day. LEDs have the advantages of increased efficiency, color specificity, size, response time, lifetime, and numerous other factors. StellarNet’s line of low cost miniature spectroradiometers are the perfect tool to analyze LEDs for both irradiant output, color, spectral profiling, and a handful of other useful values.

Spectrometers for LED Measurement
These miniature rugged spectrometers are calibrated to test LED optical output in Luminous & Radiant Flux, spectral irradiance and LUX, microwatts/cm2, moles per second, PAR, Footcandles, CRI & CQS. Currently, StellarNet offers LED measurement systems in the 200-2300nm range.  A majority of StellarNet’s spectrometers can be configured for LED measurement including the BLUE-Wave, High Resolution, High Sensitivity SILVER-Nova, and DWARF-Star NIR spectrometer models. The spectrometers can additionally be calibrated with our NIST traceable lamps for absolute intensity to be used to capture LED intensity profiles and shape. Typically an integrating sphere such as the IC2 2″ or IS6 6″ or IS12 12″ integrating sphere is used with a radiant flux calibration (RAD-CAL).

StellarNet LED Testing Solutions? – UV-VIS-NIR Ranges 200-2300nm – Low cost – Ruggedized high performance – Shock-proof – Permanently aligned – SpectraWiz Software included Free – Battery packs and handheld option for field measurements – USB-2 interface to all notebook PCs

Visible LED Measurement Spectrometers
The StellarNet miniature spectrometers are fiber optically coupled instruments with a wide selection of models for LED measurements in 200-1150nm wavelength ranges. BLACK-Comet and BLUE-Wave models are both very popular with LED testing

Visible High Resolution (HR) and High Sensitivity (SILVER-Nova) Spectrometers
The HR spectrometers have double the resolution over standard models with the same grating. The wavelength range is reduced by the same factor. Resolutions better than 0.1nm can be achieved depending on selected model range, detector, and slit size. The SILVER-Nova and SILVER-Nova-TEC-X2 offer the highest sensitivity with Thermo electric coolers down 15 & 30 degrees respectively which increase detection capabilities for low light LED measurement.

RED-Wave-NIRX-SR extended near infrared 900-2300nmNear-Infrared LED Test Spectrometers
The DWARF-Star and RED-Wave NIR spectrometers can be spectrally calibrated for NIR LED testing from 900-1700nm.  StellarNet offers various optional ranges with increase spectral resolution. Likewise a NIR can be paired with a visible unit to give you broadband spectral analysis over the 200-1100nm range.

StellarNet low cost LED Measurement Systems reliably test LED optical output in Luminous & Radiant Flux, spectral irradiance and LUX, microwatts/cm2, moles per second, PAR, Footcandles, CRI & CQS

StellarNet LED Test Report

SpectroRadiometer Test Report – Enables customers to prepare and instantly display all of the relevant test data on one sheet making quality control and R&D efforts much more efficient. Instantly, acquire a complete spectrum of your test light source and view its color distribution with an under the curve wavelength color representation.
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Handheld Spectroradiometer5
StellarNet offers LED testing systems for comparing LED Lumens, CCT, x,y chromaticity, dominant wavelength and hue for QC/QA in the field such as the StellarRad Handheld Radiometer

Integrating Sphere Calibrations
Laboratory & Research Quality LED Measurement Systems typically include a BLACK-Comet concave grating spectrometer (with optional TEC), optical fiber, and integrating sphere


NIST Calibrations for LED Testing

StellarNet Calibration ServicesThe factory performs calibrations for the appropriate wavelength range of your spectrometer using NIST traceable calibration lamps (calibration service IRRAD-CAL must be ordered with spectrometer and proper measurement accessories)

Fast delivery: most system can be calibrated and shipped within 1 week after receipt of order.

Absolute calibration: accuracy within 10% at detector integration setting used for calibration.

Certificate available: documentation with NIST traceable serial numbers.

If the user has an appropriate irradiance calibration source lamp, a field re-calibration can be easily performed using the included SpectraWiz software.


  • Fast delivery: most system can be calibrated and shipped within 1 week after receipt of order
  • Absolute calibration: accuracy within 10% at detector integration setting used for calibration
  • Certificate available: documentation with NIST traceable serial numbers.
  • If the user has an appropriate irradiance calibration source lamp, a field re-calibration can be easily performed using the included SpectraWiz software

StellarNet Integrating Spheres test LED light with an 180 field of view. The IC2 is a 2″ internal diameter sphere with 2 SMA connectors for illumination and light collection. The input port is 5/8″. The IS6 and IS12 are 6″ and 12″ StellarNet integrating spheres with 2.5″ input port with internal white coating. Mounting tripods and other accessories are available for LED measurement.

6″ Integrating Sphere

More Integrating Sphere Info…

IS6 is a 6” diameter integrating sphere with a 2.0” input port, internal reflective coating, baffle system, and SMA fiber optic output. StellarNet 6″ integrating spheres are now available with several port accessories such as calibration lamps, caps, SMA-couplers, and reducers.

12″ Integrating Sphere

IS12 For internal LED device mounting.  The StellarSphere-IS12 is a 12” diameter integrating sphere featuring a vertical hinge that opens to allow access to the sample stage. The sample stage is equipped with powered device mounting sockets with a variety of detachable socket options. In addition, the StellarSphere-IS12 includes a tungsten halogen lamp and data file for system calibration using the SpectraWiz® radiometer application software.  The IS12 option is best for customers trying to capture all of their LEDs emitted light for spectral analysis and total Lumen measurements.

IC2 is a 2” cube with internal integrating sphere. It has 5/8” input port and SMA fiber optic output. Another SMA input can be used for reflectance illumination. Select the IC2-TP miniature tripod for mounting the IC2 for alignment and repeatable measurement.

2″ Integrating Sphere

Spectrometer for LED Measurement

Experimental Setup for Laser, Laser Diode, and LED characterization. Larger Spheres such as IS6 and IS12 can be used in place of low cost IC2.

LED Measurement Sample Spectra

BLACK-Comet concave grating spectrometer for LED measurement capturing spectrum of Nichia White LED (190-850nm or 280-900nm).  SpectraWiz software displays 1931 CIE Chromaticity Diagram with xy chromaticity values within .001 of LED specifications.  Also displayed is LED dominant wavelength, purity value XYZ tri-stimulus values. SpectraWiz software allows the user to save samples, log data, auto-scale, and take dark references.

BLACK-Comet spectral overlay of UV LEDs tested for our SL1-LED UV kit. In order to choose the best LEDs for fluorescence excitation it is required that the StellarNet R&D test all incoming LEDs for wavelength and absolute intensity as compared to the manufacturers specifications.

BLACK-Comet-SR concave grating spectrometer for LED measurements displaying irradiance values in Lumens as well as correlated color temperature (CCT). Choose model C-SR (200-1080nm) or CXR-SR (220-1100nm)

*Note only Concave grating spectrometers can be NIST calibrated for deep UV (IRRADUV-CAL) and VIS (IRRAD-CAL) measurements simultaneously.

BLUE-Wave-VIS model miniature spectrometer can be calibrated for irradiance measurements also.  The spectrometer has a range from 350-1150nm and can be calibrated for irradiance measurements (IRRAD-CAL).  BLUE-Wave spectrometers have the advantage of being smaller and powered by USB; however, lack the benefits of research grade concave grating optics.  Check with a sales representative to determine the best spectrometer for your LED analysis.

Item Miniature Fiber Optic SpectroRadiometers for LED Measurement Price
BLUE-Wave Visible spectrometer 350-1150nm (UV options available) $2,700
BLACK-Comet Concave Grating spectrometer for UV-VIS. C (190-850nm) or CXR (280-900nm) $2,950
BLACK-Comet  “SR” Super Range Concave Grating spectrometer for UV-VIS-NIR. C -SR (200-1080nm) or CXR-SR (220-1100nm) $3,495
BLACK-Comet TEC Upgrade Thermo Electric Cooler (TEC) upgrade for low light LED testing to improve measurement sensitivity and detection capability. TEC reducing noise effects over %50 at long exposures and includes a sealed and isolated detector enclosure with specialized heat sink and air flow design for added stability and cool operation.. $1,650
SILVER-Nova High Sensitivity “Super Range” spectrometer for UV-VIS-NIR 200-1100nm.   Includes UV detector upgrade, detector lens assembly, composite grating technology, and super cooled TE detector. $4,495
DWARF-Star-NIR-512 NIR Spectrometer, range 900-1700nm, with cooled 512 element PDA detector $13,125
DWARF-Star-NIR-1024 NIR Spectrometer, range 1000-1700nm, with cooled 1024 element PDA detector $17,695
DSR-CSR-512 BLACK-Comet model C-SR (UV-VIS-NIR, CCD) and RED-Wave- NIR-512 (InGaAs PDA) for 200-1700nm $16,620
DSR-CSR-1024 BLACK-Comet model C-SR (UV-VIS-NIR, CCD) and RED-Wave-NIR- 1024 (InGaAs PDA) for 200-1700nm $21,190
Stellar-RAD Handheld-Radiometer to measure illuminance, chromaticity, dominant wavelength and the spectral distribution of all visible light 350-1100nm. Full spectral data is collected using <1nm research grade optics. It has a 7″, touch-pad tablet interface that’s both ergonomic and user-friendly. All calibrations & CR2 cosine receptor included in system package price. $3,495
NIST Traceable Calibrations per spectrometer channel
IRRAD-CAL SpectroRadiometric Calibration VIS-NIR for range 300-1100nm or 900-1700nm $250
IRRADUVN-CAL SpectroRadiometric Calibration VIS-NIR for range 300-1700nm $500
IRRADUV-CAL SpectroRadiometric Calibration UV for range 200-400nm $250
RAD-CAL Radiant power calibration (flux) in Watts/nm and Lumen/nm (for LEDs) 300-1100nm $250
RAD-CAL-SR Radiance calibration in Watts/sr/m^2/nm can measure Cd/m^2/nm – requires CR-LENS for CR2 $250
IRRAD-CAL-DOC Optional Irradiance Calibration certificate with NIST traceable serial numbers $125
Fiber Optic Accessories for Irradiance Measurements
CR2 CR2 Cosine Receptor for UV-VIS-NIR 1/4 inch diameter and 180° field of view $180
CR2-AP Screw on 10% aperture for CR2, allows measurement of light that is 10 times brighter $165
IC2 Integrating Cube Receptor (Sphere), 2 x2 x2 inches with 5/8 inch input port $495
IS6 6” integrating sphere with a 2.0” input port, 1 SMA fiber optic output, and internal white coating $1,745
IS12 12” integrating sphere that allows for internal mounting of devices for light measurement such as discrete LEDs, arrays, and bulbs. The sphere opens for simple access to mounting devices. IS12 Sphere includes lamp with data file used to calibrate the system for total flux measurements in watts/nm and lumens/nm. $3,495
F600-VISNIR Armored 2 meter fiber optic cable attaches Receptor to SpectroRadiometer $160
F600-UVVIS-SR Armored Solarization Resistant 600um fiber optic cable – 2 meters $195
IC2-TP Tripod for mounting and positioning IC2 light receptors $65
*Note: actual spectrometer range can be smaller than range described for radiometric calibration
*Please contact a StellarNet sales representative about more spectrometer configurations
*Annual recalibration discounts and recalibration packages available

Free SpectraWiz Softwaresoftware The powerful SpectraWiz® spectrometer software is provided free of charge with every spectrometer instrument. This includes drivers and customizable software for Windows. The SpectraWiz software is considered the “Swiss Army Knife of Spectroscopy” and may be used to accurately measure wavelength emissions, reflectance, transmission, absorption, concentrations, and absolute intensities. In addition to real-time spectroscopy, SpectraWiz® has built-in applications for SpectroRadiometry, SpectroColorimetry, ChemWiz chemistry lab concentration analyzer, and UV level monitors. Download SpectraWiz Software FREE

White LED watts cielab_large

SpectraWiz Software Suite for LED Measurements

  • Absolute intensity measurements Watts/m2
  • µm watts/cm2
  • PSD
  • Lumens/m2 — LUX
  • Moles per second — PAR
  • Footcandles /m2
  • Radiant Flux (watts) / Luminous Flux (lumens)
  • CIELAB xy Chromaticity, dominant wavelength, purity
  • Correlated Color temperature (CCT)
  • Set Power Spectral Density (PSD) range

Related StellarNet Software Products

The powerful SpectraWiz®  spectrometer software is provided free of charge with every spectrometer instrument.




CRI CQSVBA source code program for MS Excel to instantly grab & graph spectral data  from spectrometer. The program includes simple spectroscopy applications such as absorbance, transmittance, reflectance, and radiometry. Several versions even calculate CRI & CQS (Color Rendering Index & Color Quality Scale) all in a comprehensive spreadsheet.



SpectraWiz LabVIEW
StellarNet provides several
customizable programs for National Instruments LabVIEW version 8.X from basic spectral acquisition to full spectroscopy programs including spectralabsorbance, transmittance, reflectance, emissions, radiometry, trend channels, and CIELAB xy calculations



Demo Source Codes/Programs
StellarNet provides with each spectrometer purchase a complete software development toolbox of sample source codes and programs.  New additions include demo program source projects for SDK and C sharp compilers.



Now available StellarNet Linux Driver and JSON interface written in Python


Dual DSR with FCI medium

Dual DSR Spectroradiometer- StellarNet Dual DSR system pictured above uses a Y bifurcated fiber (F600-Y-UVSRNIR) to connect a BLACK-Comet-SR spectrometer and a RED-Wave NIR Spectrometer. The entire system can be radiometrically calibrated over the range 200-1700nm. Above system pictured with Flash Capture Interface (FCI) that allows spectrometer to capture emission from flashing sources such as flashtubes and pulsed solar simulators.


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