ILT960-VIS Spectroradiometer for Visible Light Applications


ILIT960-VIS Spectroradiometer

Part Number: ILT960-VIS US

The ILT960-VIS is a compact portable mini spectrometer used to measure both the lights amplitude and wavelength and provide calibrated spectral irradiance, radiance or power measurements. The ILT960 kits are combined with high end optics for proper light collection including diffusers for cosine correction, integrating spheres for total flux and radiance barrels for a narrow FOV.  All ILT960 spectrometers include both wavelength and optical NIST traceable - ISO/IEC 17025:2017 Accredited calibrations with certification and data files. Complimentary SpectrILight III software is included at no cost and DLL’s are available upon request.



  • Compact, portable design
  • 200 - 850 nm sensitivity range
  • VIS , UV,  and full range UV-NIR calibrations available
  • Extensive software package included
  • Calculates both Radiometric and Photometric values
  • Broad light level range is adjustable
  • Linear and repeatable measurements


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The ILT960- VIS Systems Have Been Optimized For VIS Light Applications And Comes In 4 Standard Configurations:


ILT960 with accessories

All systems come standard with SpectrILight III software, 1 meter long fiber, input optic, tripod, hard storage case, and calibration

Four standard configurations:

  • ILT960VIS-RAA4 (Right angle optic with 11 mm aperture, irradiance/illuminance cal.).  Available for purchase in our eStore!
  • ILT960VIS-INS50 (includes 2” integrating sphere with 7 mm port, 1m fiber, flux/power cal.)
  • ILT960VIS-R2 (Radiance barrel with 2 deg FOV, radiance/luminance cal.)
  • ILT960VIS-W (Diffuser 1” surface area, 1m fiber, irradiance/luminance cal.)



One ILT960-VIS can be used with numerous input optics. Each input optic requires its own unique calibrations, however multiple calibrations can be performed on a single spectrometer, allowing measurements of total flux (W, lm), irradiance (W/cm2), radiance (W/sr/cm2), luminance (cd/m2), and illuminance (lux) with just one system

Watch a demo of the ILT960 spectroradiometer with SpectrILight III software


Optional Spectroradiometer Accessories

Click on image to go to Spectroradiometer Accessories page.


  • Three integrating spheres:  2", 5", 10"
  • Two luminance optics:  spot luminance and +/- 2 Deg FOV
  • Three versions of cosine receptors; mini, standard, right angle
  • Four fiber optic cables; bundled 2 m L, 600 um 1 m long, 200 um .5 m Long, Bifurcated
  • Validation lamp and power supply for integrating spheres, reference measurements
  • Reflectance reference - white
  • Spot finding light source for luminance optics
  • Optical Bench post
  • SpectrILight III Software


SpectrILight III Software

SpectrILight™ III is a LabView™ based software package for Windows that allows you to acquire spectral and color data.  Analysis of the data is now calculated instantly within the same program - no exporting required!
SpectrILight™ III includes calculations for metamerism, and 2 and 10 degree observer. The 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.


Download the latest version of SpectrILight III here.

Get the SpectrILight III DLL here.

ILT960UV scan
ILT960 graph


ILT960 graph 3


ILT960 graph 4


SpectrILight scan
Model ILT960-UV ILT960-VIS ILT960-BB
Detector CMOS Linear Sensor CMOS Linear Sensor CMOS Linear Sensor
Focal Length 60 mm 60 mm 60 mm
Wavelength Range 180 - 500 nm 180 - 850 nm 180 - 1100 nm
Slit 50 um 25 um 25 um
Resolution <=.9 nm <=1.2 nm <=2.3 nm
Optical Design Symmetrical Czerny-Turner Symmetrical Czerny-Tuner Symmetrical Czerny-Tuner
SNR 330:01:00 330:01:00 330:01:00
Dynamic Range 3450 3450 3450
Integration Time 0.2 ms-1 min 0.2 ms-1 min 0.2 ms-1 min
Stray Light <.2% <.2% <.2%
Wavelength Accuracy +/- 0.21 nm +/- 0.3 nm +/- 0.6 nm
Dynamic Dark Correction Yes Yes Yes
Non-Linearity Calibration Yes Yes Yes
Wavelength Calibration Yes Yes Yes
Trigger Compatible Yes Yes Yes
Synchronization Compatible Yes Yes Yes
ADC 16 bits, 2.5 MHz 16 bits, 2.5 MHz 16 bits, 2.5 MHz
Data Transfer Speed:      
Operating Temp 0-50 Deg C 0-50 Deg C 0-50 Deg C
Interface USB 2.0 UART USB 2.0 UART USB 2.0 UART
Calibration NIST Traceable/ ISO17025 Accredited NIST Traceable/ ISO17025 Accredited NIST Traceable/ ISO17025 Accredited
Dimensions (mm) HxWxL 35.4 x 86 x 110 35.4 x 86 x 110 35.4 x 86 x 110
Power 300mA@5VDC (supply voltage 4.75-5.25) 300mA@5VDC (supply voltage 4.75-5.25) 300mA@5VDC (supply voltage 4.75-5.25)



Ranges with Input Optics

Optics ILT960-UV ILT960-VIS ILT960-BB
RAA4 200-500 (Dual Source) 200-850 (Dual Source) 230-1050 (Dual Source)
W/A2 (+MPS2354P2Xd) 200-500 Dual Source 250-850 Dual Source 250-1050 Dual Source
R2 N/A 380-850 (Single Source QTH) 380-1050 (Single Source QTH)
R3 N/A 380-850 (Single Source QTH) 380-1050 (Single Source QTH)
INS50 200-400 (Dual Source D2) 380-850 (300-850 Dual Source) 350-1050 (300-1050 Dual Source)
INS125 + P6/SMAW N/A N/A 350-1050 Single Source QTH
W5 250-500 (Dual Source) 250-850 (Dual Source) 350-1050 Single Source QTH






















Radiometric Accuracy: 

200-250 ±15%*
250-450 ±10%*
450-950 ±5%

* Requires dual source calibration upgrade to assure radiometric accuracy in the UV


Optical Calibration Uncertainties for the ILT960

Dual Source Calibration Uncertainty
200-250 ±15%
250-450 ±10%
450-950 ±5%

VSD2 Single Source Calibration uncertainty
200-250 +/-15%**
250- 400±10%

VSQTH Single Source Calibration Uncertainty
350-450 ±10%
450-950 ±5%

**Not all configurations can be calibrated down to 200 nm due to low sensitivity  of the spectrometer with reduced throughput of input optics