Gamma Scientific LED Testing Spectroradiometers

As the inventors of the first high-performance, computer-controlled LED spectroradiometers, Gamma Scientific has continued to set the standard in spectroradiometer accuracy and reliability.

Gamma Scientific Spectroradiometers are trusted by the world’s leading organizations to provide accurate measurements.

Gamma Scientific LED spectroradiometers exceptional low-light measurement capability and superior blue-light region sensitivity over conventional front-illuminated CCD-based systems further enhances accuracy for determination of LED’s half-power bandwidth, peak wavelength, color temperature, luminance and proper binning.



Systems are easily configurable to measure different aspects of LED output. The standard system comes with optics for spectral radiant intensity (and luminous intensity in candelas) following the CIE Publication Number 127 recommendations. It can also be coupled to an integrating sphere for total flux measurements, both 2 pi and 4 pi steradians; or a computer-controlled 2-axis goniometer for spatial intensity measurements.

Gamma Scientific offers three models of spectroradiometers for LED testing applications to meet different testing requirements and budgets.

GS-1290 Spectroradiometer Features

  • Recommended geometry from CIE Pub. No. 127; Condition A & B
  • Exceptional accuracy via high-resolution bandwidth coverage
  • Superior wavelength and color accuracy via low thermal expansion coefficient materials
  • Near-real-time measurement
  • High resolution: 0.4 nm/pixel
  • Spectral ranges: 200-780, 260-900 nm, 200-1100 nm, and 380-810 nm
  • USB interface
  • Windows-based control/analysis software
  • NIST-traceable accuracy
  • Self-calibrate (System never has to be returned for calibration)

GS-1220 Spectroradiometer Features

  • 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
  • Spectral ranges: 250-900 nm, 380-900 nm, 380-1100 nm
  • NIST-traceable calibration
  • 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

GS-1190 Spectroradiometer Features

  • Recommended measurement configurations for LED intensity and total flux
  • Near-real-time measurement
  • High resolution: 0.2 nm/pixel
  • Spectral range: 380-780 nm
  • USB 2.0 interface
  • Windows-based control/analysis software
  • NIST-traceable accuracy

GS-1290 LED Spectroradiometer Specifications

Detector and Wavelength Specifications
Spectrometer GS-1290-1 GS-1290-2 GS-1290-3
Nominal Spectral Range 200-800 nm 200-1100 nm 360-940 nm
Datapoint Interval 0.6 nm 0.9 nm 0.6 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
20 nm
10 nm
5.0 nm
2.7 nm
1.8 nm
10 nm
5.0 nm
2.5 nm
1.4 nm
1.0 nm
Wavelength Repeatability 0.02 nm 0.03 nm 0.02 nm
Wavelength Accuracy ± 0.1 nm ± 0.2 nm ± 0.1 nm
Accuracy
Luminous Intensity ± 1% ± 1% ± 1%
Luminous Flux ± 1% ± 1% ± 1%
Chromaticity (CIE 1931 xy)² x,y = ± 0.0015 x,y = ± 0.002 x,y = ± 0.0015
Dominant Wavelength ± 0.5 nm ± 0.5 nm ± 0.5 nm
Sensitivity
Luminous Intensity (10:1 signal-to-noise) 0.002 mcd to 15 kcd 0.002 mcd to 15 kcd 0.002 mcd to 15 kcd
Luminous Flux (12″ sphere; 10:1 signal-to-noise) 0.1 mlm – 250 klm 0.1 mlm – 250 klm 0.1 mlm – 250 klm
Measuring Time (range) 5 msec to 300 sec 5 msec to 300 sec 5 msec to 300 sec
Measuring Time at 1 mcd (10:1 signal-to-noise) 40 msec 40 msec 40 msec
Specifications for All Spectroradiometers
Stray Light Less than 1 x 10-4
Spectral Sensor Temperature-Stabilized Back-Thinned 1024×128 element CCD Array
Electrical Resolution 16 bit
Dynamic Range (single scan) 64,000:1
Computer Interface USB 2.0
Control Software Lightouch LED software for Windows
Dimensions 5.25″ H x 17.25″ W x 16.25″ L
13.34 cm H x 43.8 cm W x 41.28 cm L
Weight 30 lbs (13.6 kg)

GS-1220 LED Spectroradiometer Specifications

Detector and Wavelength Specifications
Spectrometer GS-1220-0 GS-1220-1 GS-1220-2
Nominal Spectral Range 250-900 nm
UV-VIS
380-900 nm
VIS
380-1100 nm
VIS-NIR
Datapoint Interval 0.32 nm 0.32 nm 0.35 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 Repeatability 0.02 nm 0.02 nm 0.02 nm
Wavelength Accuracy ± 0.1 nm ± 0.1 nm ± 0.1 nm
Accuracy
Luminous Intensity ± 1% ± 1% ± 1%
Luminous Flux ± 1% ± 1% ± 1%
Chromaticity (CIE 1931 xy)² x,y = ± 0.0015 x,y = ± 0.0015 x,y = ± 0.0015
Dominant Wavelength ± 0.5 nm ± 0.5 nm ± 0.5 nm
Sensitivity
Luminous Intensity (10:1 signal-to-noise) 0.02 mcd to 15 kcd 0.02 mcd to 15 kcd 0.02 mcd to 15 kcd
Luminous Flux (12″ sphere; 10:1 signal-to-noise) 1 mlm – 240 klm 1 mlm – 240 klm 1 mlm – 240 klm
Illuminance Sensitivity (10:1 signal-to-noise) 0.02 mlux – 15,000 lux 0.02 mlux – 15,000 lux 0.02 mlux – 15,000 lux
Measuring Time (range) 2 μsec to 2.67 sec 2 μsec to 2.67 sec 2 μsec to 2.67 sec
Measuring Time at 1 mcd (10:1 signal-to-noise) 40 msec 40 msec 40 msec
Specifications for All 1220 Spectroradiometers
Stray Light Less than 1 x 10-4 (at 8 times the HPBW from HeNe Laser Line)
Spectral Sensor High Resolution 2048 pixel CCD Sensor
Temperature Stabilized Sensor -5° C below ambient
Electrical Resolution 16 bit
Dynamic Range (single scan) 6,670:1
Computer Interface USB 2.0
Control Software Lightouch LED software for Windows
Dimensions 5.25″ H x 12.00″ W x 10.20″ L
13.34 cm H x 30.48 cm W x 25.91 cm L
Weight 20 lbs (9.1 kg)
  • Accuracy specifications assume sufficient signal to noise and are valid immediately after proper calibration, relative to the calibration standard
  • Applies to colored LEDs with sufficient signal-to-noise ratio
  • Sensitivity specifications assume a 10:1 signal-to-noise ratio for white 5000K CCT LED’s
  • Luminous flux is with a GS-IS300 integrating sphere calibrated with Deuterium and tungsten standards to cover a 250 to 860nm range
  • Specifications are subject to change at any time without notice

GS-1190 LED Spectroradiometer Specifications

Detector and Wavelength Specifications
Detector CCD Linear Array
2048 Pixels
Sensing Pixel Size: 14µm x 200µm
Sensitivity: 1800 V/(I*s) @660nm
Dimensions (mm) 6.3″L x 4.1″W x 2.1″H
160mm L x 103mm W x 54mm H
Weight 0.7lbs (0.3kg)
Spectral Range 380-780 nm
Spectral Resolution 5-10nm
Gratings 600 G/mm
Input Fiber: SMA 905, 1000µm core ø fiber
Numerical Aperture: 0.2
Slit: 50, 100, 150, 350, 600µm
Power Input 5VDC, 140 mA
Power Consumption Rate 0.6-0.7 W
Temerature Range 15°C to 40°C
Software GS-1190 software package
Computer Interface USB 2.0, 16 bit, 800KHz
Measurement Specifications
Peak Wavelength Accuracy ± 0.5 nm
Dominant Wavelength Accuracy ± 0.5 nm
Luminous Flux Accuracy ±4%
Range dependant on sphere size
CIE 1931 x,y Accuracy ± 0.003
Correlated Color Temperature (CCT) Range: 1000K to 100,000K
Accuracy: ±5%
Half-Power Bandwidth (FWHM) Accuracy ±0.5nm
Spectral Purity ±5%
Color Rendering Index (CRI) ±5%

Spectroradiometer Resources