- 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 Systems Overview
- NIST Calibrations
- Integrating Spheres
- Setup Diagrams
- Application Videos
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.
Near-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
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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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
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
The 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.
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.
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.
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|
*Please contact a StellarNet sales representative about more spectrometer configurations
*Annual recalibration discounts and recalibration packages available
Free SpectraWiz Software 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
- Absolute intensity measurements Watts/m2
- µm watts/cm2
- 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
The powerful SpectraWiz® spectrometer software is provided free of charge with every spectrometer instrument.
VBA 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.
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 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.