The measurement of LEDs presents uniqueapplication requirements for which
Avantes has the appropriate instrumentation and applications experience to assist
our customers in configuring a system.
Avantes’ many years of working with LED
application has prompted us to develop
a variety of system configurations thatmeets most LED metrology requirements.
Light Emitting Diodes can be measured
in a wide variety of colors and brightness.
Accurate measurement of the LEDs therefore is essential. This can be done in twoways: photometry and radiometry.
Photometry relates to visible radiation
alone, just as the response of the humaneye. Radiometry goes beyond these limitations. In both photometry and radiometry,
the LED can be characterized in emitted
power or in intensity. Emitted power is all
the power (flux) emitted from the LED inlumens or Watts, collected and measured
without regards to the direction of theflux. The intensity is the ratio of the flux,
leaving the source and propagating in theelement of solid angle containing the given
direction, and is expressed in candelas.

For basic measurements of photopic

parameters and irradiance (excluding flux)a system is typically configured with theAvaSpec-ULS2048-USB2-FCPC spectrometers, a 25 or 50 µm slit and 300 line/mm
grating covering the range from 360-1100
nm and provides 1.4 -2.4 nm full width half
maximum (FWHM) resolution. A 2 meter
fiber-optic cable (FC-UV200-2-FC-SMA) is
mated to the instrument and terminatedin a cosine function diffuser (CC-UV/VIS/NIR) which has 3.9 mm diameter surface
area. The entire system is irradiance calibrated with an NIST source over the specified wavelength range for spectral irradiance (µW/cm2/nm). This calibrated system
can be operated using Avantes proprietary
AvaSoft-IRRAD software which provides
the following parameters: X, Y, Z, x, y, z,u, v, CRI, Color Temperature, Dominant
Wavelength, Complementary Dominant
Wavelength, FWHM, Centroid, Peak
Wavelength & Purity. Additionally raw
data in scope mode is displayed, as well as
the X-Y chroma-ticity diagram. Optionally,
the system can be configured with longer
fiber lengths and the AvaTripod to holdthe diffuser in place during measurement.
The system can be controlled via Avantes
dynamic linking library (DLL) interface
through LabView, C#, C++ and a number ofother programming environments.
For flux measurements the entire LED must
be inserted into the port of an integratingsphere. Avantes offers a complete line ofintegrating spheres ranging from 30-200
mm (internal diameter).

You created this PDF from an application that is not licensed to print to novaPDF printer (http://www.novapdf.com)

For system calibrations, Avantes offers
the AvaLight-HAL-CAL calibration sources
which are offered in configurations that arecompatible with cosine diffusers and small
integrating spheres (30, 50, 80 mm).
Avantes also offers two system configurations to enable the CIE Average LED
Intensity (ALI) measurements which are
specified in the CIE Publication No. 127.
AvaSPEC-IRRAD-ILEDA and AvaSpec-IRRADILEDB correspond to the condition A (316mm measurement distance) and condition
B (100 mm measurement distance) standards, respectively. The system is typically
based upon the AvaSpec-ULS2048-USB2FCPC spectrometers which are configured
with a 25 or 50 µm slit and 300 line/mm
grating covering the range from 360-1100
nm and provide 1.4-2.4 nm (FWHM) resolution. A fiber-optic cable (FC-UV200-2) ismated to the instrument and terminated in
our AvaSphere-IRRAD-30 integrating spherewhich couples with the corresponding ILEDTUBE-A or ILED-TUBE-B. The system is irradiance calibrated with a NIST source overthe specified wavelength range for spectral
irradiance (µW/cm 2/nm). The ILED TUBE-A
or ILED-TUBE-B is coupled with the AvaLED-Holder-5 mm (LED holder for 5 mm/T1 3/4 LEDs) which is coupled with a current
stabilized power supply.

More and more countries ban incandescentlamps from being sold, hugely boosting
LED sales. Avantes supplies the needed
tools for photometric and radiometricmeasurements.
The spectrometer is irradiance calibrated
to obtain absolute values.

Typical applications:
Irradiance
IlluminanceRadiometric & photometric flux
Lumineous intensity
Color coordinates... and many more
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
The widely used recommendation for LED
bulb luminous intensity measurements
is CIE’s Publication 127. This set contains
everything you need: an irradiance calibrated spectrometer, with FC/PC connector
for reproduceable setups, with a fiber cableand ILED-A & ILED-B tubes.

Typical applications:
Lumineous intensity
Radiant intensity
Low & medium powered LEDs... and many more
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

www.phototechnica.co.jp〒336-0017 埼玉県さいたま市南区南浦和 1-2-17

TEL:048-871-0067

FAX:048-871-0068

e-mail:voc@phototechnica.co.jp



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