GS-1220 Spectroradiometers

RadOMA GS-1220 spectroradiometers are optimized for quality control and high speed LED testing applications, with up to 100 ms optical integration time.

The GS-1220 spectroradiometer features a proprietary optical design and back illuminated CCD technology that provides exceptional low-light measurements, superior blue light sensitivity and highly accurate measurements of wavelength, color and power.

The 2048 pixel back illuminated CCD is temperature cooled for superior instrument repeatability.

Original system calibration is performed in Gamma Scientific’s NVLAP accredited laboratory (NVLAP Lab Code 200823-0) using NIST-traceable standards.

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Testing Applications
  • LED Testing
  • Display Measurement
  • Reflectance and Transmission Testing
  • NVIS Testing


  • High resolution, temperature cooled-back illuminated 2048 pixel CCD Sensor
  • Exceptional accuracy via high-resolution bandwidth coverage
  • Superior wavelength and color accuracy
  • Near-real-time measurement
  • NIST-traceable calibration
  • Spectral ranges: 250-900 nm, 360-900 nm, 360-1100 nm
  • Integrated neutral density filter wheel
  • Hardware input/output trigger
  • Windows based control/analysis software with Excel integration
  • Wide variety of test sockets for many LED types


Integrating Spheres

Available in a wide range of sizes from 25mm to 3m in diameter. Multi-purpose integrating spheres provide maximum flexibility and are custom built to meet your exact testing requirements. Light measurement spheres for LED testing are optimized for capturing total flux measurements of LEDs.

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940 LED 1200 Goniometer
Gamma Scientific’s 940 LED-1200 and 940 LED-1850 Goniometers are designed to analyze angle dependent spatial radiation properties of LED luminaires, lamps and modules.

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Calibration Light Sources

RS-14 Uniform Light Source
Gamma Scientific manufactures a wide range of calibration light sources. The RS-10D is a precision source of radiant flux used to calibrate spectroradiometers and other light measurement instrumentation. The RS-12 is a versatile light source that can be used as a white light standard of spectral radiance or luminance, with optimal near-infrared output for spectroradiometer calibration.

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Data Sheet (PDF)

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GS-1220 Spectroradiometer Specifications


Detector and Wavelength Specifications
Nominal Spectral Range250-900 nm
360-900 nm
360-1100 nm
Datapoint Interval0.32 nm0.32 nm0.35 nm
Spectral Bandwidth
(Built-in User Selectable Half-Power Bandwidth
(HPBW). Factory Setting in Bold)
10 nm
5.0 nm
2.5 nm
1.4 nm
1.0 nm
10 nm
5.0 nm
2.5 nm
1.4 nm
1.0 nm
10 nm
5.0 nm
2.5 nm
1.4 nm
1.0 nm
Wavelength Repeatability0.02 nm0.02 nm0.02 nm
Wavelength Accuracy± 0.1 nm± 0.1 nm± 0.1 nm
Luminous Intensity± 1%± 1%± 1%
Luminous Flux± 1%± 1%± 1%
Chromaticity (CIE 1931 xy)²x,y = ± 0.0015x,y = ± 0.0015x,y = ± 0.0015
Dominant Wavelength± 0.5 nm± 0.5 nm± 0.5 nm
Luminous Intensity (10:1 signal-to-noise)0.02 mcd to 15 kcd0.02 mcd to 15 kcd0.02 mcd to 15 kcd
Luminous Flux (12″ sphere; 10:1 signal-to-noise)1 mlm – 240 klm1 mlm – 240 klm1 mlm – 240 klm
Illuminance Sensitivity (10:1 signal-to-noise)0.02 mlux – 15,000 lux0.02 mlux – 15,000 lux0.02 mlux – 15,000 lux
Measuring Time (range)3 μsec to 2.67 sec3 μsec to 2.67 sec3 μsec to 2.67 sec
Measuring Time at 1 mcd (10:1 signal-to-noise)40 msec40 msec40 msec
Specifications for All 1220 Spectroradiometers
Stray LightLess than 1 x 10-4 (at 8 times the HPBW from HeNe Laser Line)
Spectral SensorHigh Resolution 2048 pixel CCD Sensor
Temperature Stabilized Sensor-5° C below ambient
Electrical Resolution16 bit
Dynamic Range (single scan)6,670:1
Computer InterfaceUSB 2.0
Control SoftwareLightouch LED software for Windows
Dimensions5.25″ H x 12.00″ W x 10.20″ L
13.34 cm H x 30.48 cm W x 25.91 cm L
Weight20 lbs (9.1 kg)

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