Spectroradiometer 200 - 450 nm and 250 - 1050 nm

ILT950 / ILT950UV from International Light Technologies

The ILT950 is equally at home on the production floor as well as in the laboratory combining high performance, accuracy, ease of use, and a wide array of features all in a rugged, compact, portable design.

The excellent performance of the ILT950 has been improved further with the addition of a new machined optical bench for reduced stray light and improved thermal stability.

The ILT950 and ILT950UV spectroradiometers also now use the new higher pixel SONY CCD array for improved performance including nearly 50% more sensitivity over the entire spectral region, and higher S/N ratio increased from 200:1 to 300:1 with larger quantum well depth.

These improvements combined with the new features in our powerful SpectriLight III software, including PAR μmol/m²/s, metamerism, and baseline overlay comparisons, make the ILT950 a top performer in the CCD array spectroradiometer market.

  • NIST-traceable, ISO17025 accredited calibration
  • UV-VIS-NIR-Range
  • Resolution: 1.4 nm with 25 micron slit
  • Focal length: 75 mm
  • Symmetrical Czerny-Turner

Further information

SpectriLight III – ILT550 and ILT950 series control & analysis software

SpectriLight™ III is a LabVIEW based software package for Windows that allows you to acquire spectral and color data.

The new version of SpectriLight™ III has additional calculations for metamerism, and 2 and 20 degree

observer. The new overlay feature allows the user to compare the base reading to current readings. Wavelength range, integration time, scan average and other controls can be easily set through pop up windows, menus and tool bars.

Absolute irradiance and chromaticity are calculated instantly.

SpectriLight™ III is LabVIEW based software and can be easily customized for specific OEM applications. For API applications, Multiple DLL’s are available.


  • Automated time line measurements
  • Access multiple calibration files
  • Auto-integration simplifies user interactions
  • Scan average: 1 to 999 for reduced noise
  • External trigger
  • Peak find
  • Enhanced scaling and zoom features including movable vertical cursors
  • Export to ASCII text or directly into Excel. Save screens/scans in multiple formats including
  • .bmp, .jpg, and .png
  • Powerful import data wizard can even import data from other spectrometers

SpectriLight™ III version 5 new features

  • Overlay: allows comparison to baseline reading
  • PAR: plant growth calculations
  • New color calculation includes 2 and 10 degree observer, and metamarism

Optional input optics

ILT-R2 Radiance optic
Specialized fiber optic produces an average field of view of 2 degrees for radiance/luminance measurement of extended sources. Requires ILTVS950R calibration.

ILT-RAA4 Right angle cosine adapter
with approx. 6.9 mm diameter aperture, permits measurement of light sources 90º to the standard fiber. Sold with weighted screw-on handle for more stable detector placement when needed. Excellent cosine response, increases signal transmitted to CCD spectrometer, excellent for lower light, low profile, and small diameter light pattern measurements. Calibration required (sold separately).

ILT-INS50 2-inch Integrating sphere
with 2 ports; SMA905 and 5 mm port with lambertian response. For testing mounted and unmounted LEDs, fiber optics and miniature lamps. Provides readout of total flux in watts and lumens, irradiance in W/cm2, illuminance in lux, color purity, spectral distribution and color temperature with ILT550 (requires ILT-VS950P calibration). Alternative: ILT-INS125 5-Inch Integrating sphere and ILT-INS250N 10-inch Integrating sphere.

2 meter long, 1000 micron, armored fiber optic light guide. Transmits light from 250 -1050 nm. Strong armored cable adds additional protection against breakage often required for longer fiber lengths.

Real-time analysis

  • Irradiance: Total, Visible, UVA, UVB, UVC, PAR and photopic data
  • Selectable bandwidth for irradiance, power and radiance (requires additional hardware and
  • calibration options)
  • Chromaticity analysis: x, y, u, v coordinates and display in CIE color spaces
  • Dominant and complementary wavelength and color purity
  • General Color Rendering Index (CRI) and 15 special color rendering indices
  • Correlated Color Temperature (CCT) and DUV


ILT 950

250 - 1050 nm
Resolution: 1.4 nm with 25 micron slit

Calibration options: Single source 350 - 1050 nm or dual source 250 - 1050 nm


200 - 450 nm
Resolution: >1.0 nm with 50 micron slit

Calibration option: single source 200 - 350 nm or dual source 200 - 450 nm

NIST-traceable, ISO17025 accredited calibration*
CCD array 2048 pixel Sony
Focal length 75 mm
Dynamic range 3300
Optical configuration Symmetrical Czerny-Turner
Stray light <0.3%
Signal/noise 300:1
Integration time 2ms-20 s
Data transfer speed 2 ms/scan, 16 bits, 2 MHz
Trigger No
Synchronization No
Dynamic dark correction Yes
Non-linearity calibration Yes
Temperature range 15 - 40 °C
Size 41 x 127 x 178 mm
Radiometric accuracy

200 nm - 350 nm: ±20% **
>350 nm - 400 nm: ±10% **
>400 nm - 900 nm: ±5%
>900 nm - 1050 nm: ±10%

* Note: Dual range calibration with D2 and QTH light source is strongly recommended for broadband measurements encompassing UV below 350 nm due to low output of the QTH lamp which increases the difficulty of accurate UV calibration.
** Requires dual source calibration upgrade to assure radiometric accuracy in the UV


LED test & measurement
Plant Growth/PAR/Plant Photobiology
Characterization of Solar Simulation
Characterization of UV Curing Systems
Photostability Testing
Accelerated Weathering
Radiometery and Photometry Measurements
LED Illumination and Color Analysis
Absorbance/Transmittance of Fibre optics


Near-infrared orientation of Mozambique tilapia (App Note)


Sales Manager
+420 720994252
Miroslav Korinek


Quantum Design

Krivoklatska 37
199 00 Praha 9
Czech Republic

Phone:+420 607 014 278
Miroslav KorinekSales Manager
+420 720994252