For the ultimate in resolution and accuracy,  the SpectralLED® Tunable uniform light source incorporates 35 discrete wavelengths for synthesis of commercially available light sources or based on spectra that you import. The platform is easily adaptable for automated test systems and production line integration, with integrated optical feedback and temperature control to ensure rock-solid stability and consistent results.


  • Camera and image sensor calibration
  • Photodiode detector responsivity characterization
  • Spectrum / illuminant simulation
  • Diagnostic medical imaging
  • Technical and industrial photography

Unprecedented Resolution & Accuracy

  • 75mm Output with Radiance Calibration.
  • Includes standard LED set comprised of 32 discrete wavelengths plus 3 broadband channels, covering the 380nm – 1000nm wavelength range.
  • Includes built-in integrating sphere, built-in photodiode feedback/monitoring system, onboard thermoelectric cooling for the LED array, and independent 16-bit DC constant current drivers for every LED channel.
  • Firmware includes synthesis engine to simulate target spectra, serial API command set for flexible automated control, and a device specific ISO/IEC 17025 calibration with absolute NIST traceability.
  • Includes a convenient GUI application, SpectralLED Assistant, for quick and easy operation of the RS-7.
Please contact us with your custom & OEM requirements.

  RS-7-1  Optical Specifications

Spectral Range

380 nm to 1,000 nm     (Custom ranges available on request)

Spectral Output

32 discrete LED channels, 3 broadband LED channels

Visible resolution ~ 15nm, NIR resolution ~ 50 nm  (typical channel spacing)

Spectral Peaks

395nm, 405nm, 420nm, 430nm, 450nm, 460nm, 475nm, 495nm, 505nm, 520nm, 525nm, 535nm, 570nm, 595nm, 610nm, 620nm, 630nm, 637nm, 660nm, 675nm, 685nm, 700nm, 715nm, 730nm, 750nm, 760nm, 780nm, 805nm, 850nm, 895nm, 940nm, 965nm

2,700K Warm White, 3,000K Warm White, 6,500K Cool White  (Custom configs available)

Spectral Bandwidth

Typical VIS of 20nm and NIR of 50nm FWHM

Source Geometry

75mm dia, Lambertian radiant source (see RS-7-2 models for exit ports up to 600 mm dia)

Spatial Uniformity

≥ 97% over 8° field of view

Radiance Range

Typical maximum of 15,000 µW / cm2 / sr             Typical minimum of 15 µW / cm2 / sr

Luminance Range

Typical maximum of 30,000 cd / m2             (spectrum dependent)        

Typical minimum of 30 cd / m2                      (0.03 cd/m2 with ND filter option)

CCT Range

1,900K to 40,000K

Preset Spectra

CIE illuminants A, B, C, D50, D55, D65, D75, E, F1-F12, Macbeth™ / X-Rite™  patches

  Accuracy Specifications

Illumination Stability

≥ 99.99% after 50 ms for radiance or after 2,000 ms for spectrum

Illumination Accuracy

± 1% Absolute, NIST traceable

Spectral Accuracy

± 1 nm centroid wavelength

Color Accuracy

CIE 1931  x,y  ± 0.003


< 0.1 % RMS of full scale

Temperature Stability

Within ± 1° C via active TEC

Long-term Drift

Output ≤ 2%       Spectral ≤ 1 nm      (typical, channel dependent)

  Electrical Specifications

Electrical Resolution

16 bit DAC for channel current drivers      

24 bit ADC for internal radiance monitor feedback

Dynamic Range Adjustment

4-5 decades typical     (spectrum dependent)

LED Control

Pure DC constant current with floating differential sensing

  General Specifications


Firmware includes full spectral calibration with spectral fitting, preset storage, real-time optical feedback, radiometric units supported

Interface Connectors

USB 2.0 type B and DB-9

Interface Protocol

Simple ASCII commands with optional binary block transfer

Supported Operating Systems

USB drivers for Windows, OSX and Linux via FTDI virtual COM port

Legacy RS-232 serial port for integration (no OS required)

Input Voltage & Power

100 to 240 VAC at 50-60Hz, 600W maximum

Dimensions (H x W x L)

405mm (16 in) x 460mm (18.1in) x 305mm (12in).  Weight 17.5 kg (38.6 lbs)

Operating TemperatureMinimum: 0°C (32°F)Maximum: 35°C (95°F)
Operating HumidityMinimum: 20%Maximum: 80%

  Optional Upgrades

RS-7 WavemonTM

Multi-channel photodiode system w / amplitude feedback & real-time ƛ measurements


Integrated IRIS w/ stepper motor control & additional API commands for easy adjustment

Specifications are subject to change without notice

RS-7 WavemonTM   Multi-channel photodiode system with amplitude feedback and real-time wavelength measurement

The Wavelength Monitor System is a multi-channel photodiode system which provides amplitude feedback and real-time wavelength measurements. It consists of three photodiodes each with an independent transimpedance amplifier circuit. Proprietary optical filtering techniques allows for wavelength accuracy of +/-0.25nm and repeatability of +/-0.05nm. The Wavelength Monitor PCBA, photodiodes, and optical filter assembly is temperature stabilized using a Peltier cooler and thermistor in a PID feedback loop. This assembly is a discrete module which can be used with any RS-7 model.

RS-7-IRIS Integrated IRIS with stepper motor control and additional API commands for easy adjustment 

The motorized iris for the RS-7-1 is a Variable Output Port Aperture using a built-in, motorized iris. RS-7 Firmware includes iris stepper motor control, and additional API commands are provided for easy adjustment of the iris diameter.