VIS Spectroradiometer

specbos 1201

specbos 1201 is one of the smallest VIS spectroradiometers available worldwide (download datasheet). Its easy-to-use software has the full complement of radiometric and colorimetric functions requisite for research, diagnostic, and quality control applications. Several special calculations and features are implemented in the software JETI LiVal e.g. the calculation of RGB, PAR and circadian values, pass/ fail functions and a LED Ranker (Ranking of LED's and other light sources; see applications). 

specbos 1201 can be used for measurements in Irradiance mode as well as in Radiance mode with measuring diameters beginning from 4 mm. The special model specbos 1201 focus can measure diameters of 3 mm, 1 mm and 0.5 mm in radiance mode.
If only one measuring mode is of interest, it can be ordered specbos 1201L (only Radiance mode) or specbos 1201E (only Irradiance mode).

The measurement of samples in Radiant flux mode is possible with specbos 1301 and in Radiant intensity mode with specbos 1401.

Measuring values:

  • Luminance, Radiance
  • Illuminance, Irradiance
  • xy and u' v' coordinates
  • Dominant wavelength
  • Color purity
  • Correlated Color Temperature
  • Color Rendering Index
  • Circadian metrics, PAR

specbos1201 stativ 300


  • USB powered - mobile
  • Internal target spot laser for radiance
    mode measurements
  • Excel spread sheets
  • Automatically repeated measurements
    in selectable time intervals


  • General lighting applications:
    Traffic lights, car lights
    Room illumination
    Lamp burn-in tests
    TV, Monitors, LCD-, LED-, Displays     info
  • Calibration of cinema projectors    info
  • Measurement of LED luminaires    info
  • Classification of LED's   info
  • Measurement of pulsed light sources   info

Optional accessories:

JETI offers additional accessories for specbos 1201 to expand its application.  more ....



Optical Parameters
   Spectral range    380 nm .. 780 nm
   Wavelength resolution (FWHM)    5 nm
   Calculated wavelength step    1 nm
   Digital electronic resolution    16 Bit ADC (15 Bit used)
   Viewing angle (luminance mode)    1.8°
   Measuring distance/ diameter    20 cm - Ø 6 mm; 100 cm - Ø 31 mm (luminance mode)
   Measuring values    Spectral radiance;
   Total luminance/ total radiance;
   Total illuminance/ total irradiance;
   Chromaticity coordinates x,y; u',v';
   Correlated Color Temperature, color purity;
   Color Rendering Index;
   Circadian metrics, Photosynthetically Active Radiation
Measuring range and accuracies
   Measuring range luminance    2 ... 7×104 cd/m2 (higher values with optional filter)
   Measuring range illuminance    20 ... 5×105 lx
   Luminance accuracy    ± 2 % (@ 100 cd/m2 and illuminant A)
   Luminance reproducibility    ± 1 %
   Chromaticity accuracy    ± 0.001 x, y (@ illuminant A)
   Color reproducibility    ± 0.0005 x, y
   CCT reproducibility    ± 20 K (@ illuminant A)
   Wavelength accuracy    ± 0.5 nm
Technical Parameters
   Dispersive element    Imaging grating (flat field)
   Light receiving element    Photodiode array 1024 pixel (binned)
   Power supply    USB powered (no voltage < 4.8V)
   PC interface    USB 2.0 fullspeed
   Dimensions (drawing)    140 mm x 58 mm x 34 mm
   Weight    350 g
   Operating conditions    Temperature 10 ... 40 °C
   Humidity 85 % relativ humidity at 35 °C

    All inclusive accessories packet

   Cosine corrector head-piece
   Transport box
   PC software JETI LiVal
   Operating instructions (digital) and firmware commands (digital)  
   USB cable   
   Trigger connector
   Calibration    NIST traceable
   Recommended recalibration interval    1 year