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Spectro-Radiometric
Measurements
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Measure the
spectral output of just about any light or luminaire
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Light 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
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Real-time
1931 CIE Chromaticity diagram for xy Chromaticity, Dominant
Wavelength, Purity, and Correlated Color Temperature (CCT)
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Measure LED
optical output in Luminous & Radiant Flux, spectral irradiance
and LUX, microwatts/cm2, moles per second, PAR, Footcandles,
CRI & CQS
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Spectrometer
configurations available to cover the 200-1700nm range
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The StellarNet
model spectrometers are great tools for low cost, routine
analysis of all types of light. From measuring the irradiance
of standard light bulbs to measuring the exact color coordinates
of the yellow in a traffic light, StellarNet spectrometers
are used worldwide to routinely analyze light. These instruments
are calibrated to measure the spectral irradiance, radiance,
or Watt flux over the wavelength range in nanometers provided
by the selected spectrometer model.Currently, StellarNet
offers Radiometer systems in the 200-1700nm range!
SpectraWiz
Software can calculate many important values such as lumens,
xy chomaticity, dominant wavelength, Correlated Color Temperature
(CCT), and much more.
The the
bottom of the page details the various ranges for each StellarNet
Spectroradiometer. The BLUE and GREEN-Wave models, BLACK-Comet
concave grating model, and RED-Wave-NIRInGaAs model can
be configured to have the correct slit size and detector
array to suite your application. Calibrated spectroradiometers
can be used to measure absolute intensity, xy Chromaticity
(CIE 1931), purity, correlated color temperature, and dominant
wavelength.
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![](led-measurement-225x300.jpg)
Typical System consists of a BLUE-Wave Spectrometer,
Fiber Optic Cable, 6'' Integrating Sphere, and a Radiant
Flux calibration in Watts/nm
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SpectroRadiometer
Test Reporting Software
The SpectroRadiometer Test Report Software now 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. This
spectral curve allows for easy identification of color distribution
of your light source. |
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Total Power (Watts and Lumens)
- Efficiency
& Efficacy
- CIELAB
with the xy/uv chromaticity
- CCT
(Correlated Color Temperature)
- PAR
- Dominant
wavelength
- Percent
color purity.
- CRI
(Color Rendering Index)
- CQS
(Color Quality Scale)
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![](StellarNet-LED-Test-Report-240x300.jpg) |
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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. StellarNets 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 StellarNets 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
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![](led-measurement-225x300.jpg)
Typical System consists of a BLUE-Wave Spectrometer,
Fiber Optic Cable, 6'' Integrating Sphere, and a Radiant
Flux calibration in Watts/nm
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![](BLUE-Wave-spectrometer.png)
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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
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![](Raman-Spectrometers-high-Res.png) |
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-NIR-Spectrometer-StellarNet.jpg) |
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 |
![](Handheld-Spectroradiometer5-300x213.jpg)
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-300x204.jpg)
Laboratory & Research Quality LED Measurement Systems
typically include a BLACK-Comet concave grating spectrometer
(with optional TEC), optical fiber, and integrating
sphere |
![](StellarNet-LED-Test-Report-240x300.jpg) |
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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Low Light Configurations
Many popular applications involve measuring the irradiance of light
sources with low output intensities. From ambient streetlight to UV-LEDs
many people need to detect low levels of radiation. StellarNet spectrometers
can be specially configured to measure these low light levels. The
spectrometer aperture or slit can be adjusted to allow more light
into the unit, thus making it more sensitive to radiation. For low
light applications a 200um slit is the standard slit size. Additionally,
low light level calibrations can be employed to further optimize the
spectrometers ability to see low light levels. And lastly, a TEC cooler
can be installed on the detector array to increase the signal to noise
of the unit by 66%. This in affect allows the spectrometer to integrate
over longer periods of time, collecting more and more photons, while
keeping a low noise value. If you have a low light application be
sure to discuss the configuration of your spectrometer. |
Bright Light
Configurations
In contrast, many industries require the measurement of really bright
light emission. StellarNet spectrometers have a dynamic range of
6 decades allowing integration times from 1ms to 65s. StellarNet
spectrometers can be specially configured for high power applications.
The limitation of a high power radiometer will be limited by the
power of the calibration source. StellarNet can configure Spectroradiometers
to optimize calibration thus allowing the use of the units large
dynamic range and detector linearity to allow high power light measurement.
Additionally, smaller slits, fibers, and integration spheres can
be employed to decrease the signal to the spectrometer. StellarNet
offers a high light level calibration to further optimize the system
performance.
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SpectroRadiometer
Sample Spectra |
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![](LED-Amber_large.jpg) |
![](White-LED-dropdown-Spectra_large.jpg) |
SpectraWiz Software displaying 1931 xy chromaticity diagram measuring
the color and Correlated Color Temperature (CCT) of an LED.
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SpectraWiz Software allows the users to select the irradiance units.
Additionally, scroll down menus allow the user to select their collection
accessory in order to calculate radiant and luminous flux.
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![](Lumens_large.jpg) |
![](C-IG-SR_large.jpg) |
BLACK-Comet spectrometer
calculating LUX values of a bright source. StellarNet spectroradiometers
are all calibrated first with base units of irradiance in W/m^2. SpectraWiz
software applies different factors and algorithms in real-time to
calculate your favorite comparison value (e.g. Lumen, footcandle,
CCT, etc).
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Dual DSR Spectroradiometer
Halogen-lamp spectra (300-1700nm). 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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LED
Measurement Sample Spectra |
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![](White-LED-watts-cielab.jpg) |
![](White-LED-Lumen-Lux-CIE.jpg) |
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-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.
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![](StellarNet-LED-Measurement-UV.jpg) |
![](StellarNet-Radiometer-LEDs-small.jpg) |
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.
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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. Contact me to determine
the best spectrometer for your LED analysis.
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