RS-50VF Projection Light Source

To maintain constant radiant flux output, tungsten halogen lamps are used exclusively. An RS-4 Series Constant Current Power Supply is used for ultra-stable, constant-current power and monitoring with a precision shunt current measurement and comparison circuits built into the source housing.
The RS-50VF source is primarily used for generating irradiance levels at distances from 6 to 30 meters or for uniformly illuminating areas of up to 18 inches (46 cm) or more in diameter. The calibration of the source is given at a specified distance from the exit pupil. Beyond 6 meters the source has the characteristics of a point source, and approximate illuminance and irradiance levels may be generated using the inverse square law.
The RS-50VF may also be used uncalibrated to illuminate various materials of interest. The correlated color temperature of the RS-50VF source is set at CIE Illuminant A at 2856 ± 20K. The area of illumination may be varied by changing the field apertures.


  • NIST-traceable calibration for Luminous Intensity (cd), Illuminance (lux), and Irradiance (W/cm2)• NIST-traceable calibration for Luminous Intensity (cd), Illuminance (lux), and Irradiance (W/cm2)
  • Optic system with variable focus distance• Optic system with variable focus distance
  • Illuminant A spectrum curve• Illuminant A spectrum curve
  • 2856K Night time color standard• 2856K Night time color standard
  • Tungsten-halogen lamps for stable output
  • Calibrate spectroradiometers, radiometers, and photometers• Calibrate spectroradiometers, radiometers, and photometers
  • Measure reflectance and transmittance
  • Illuminate various materials• Illuminate various materials
  • Perform calibration reports in units of luminance, illuminance, radiance and irradiance

Related Component: RS-4 Constant Current Power Supply
Gamma Scientific’s RS-4 power supply is a precise, current-regulated power supply intended for use in light measurement applications. Most often paired with calibrated standard lamps or LEDs, this power supply maintains output stability over long time periods, and the entire unit is resistant to changes in the environment. This allows any calibration established in a test lab to be conserved when transporting to a customer facility. A ramping function maximizes the life of the light source by gradually changing current output from 0% to 100% over 30 seconds. This function is accessible on the front panel via an enable button or can be triggered remotely using the TTL logic function. All units come with an ISO 17025 calibration performed at Gamma Scientific’s NVLAP accredited laboratory. Any light standard being used is typically calibrated with it as a pair, good for 200 hours or 12 months of use. A built-in timer on the front panel helps track the accumulated use of output power which also logs total time used by the calibration standard. With a selectable internal power supply accepting 100 to 240VAC, this precision functionality can be used anywhere.

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