The RS-50 projection light source is a precision source of radiant flux, used primarily to calibrate light-measuring instrumentation and as stimuli to measure detection devices.

Conservative design and rigid quality standards make Gamma Scientific sources the ones by which others are judged. They may be used as standards of irradiance or radiance, traceable to the National Institute of Standards Technology (NIST).

Near-constant radiant flux output is achieved via exclusive use of tungsten-halogen lamps. Ultra-stable, constant-current supplies utilize precision shunt-current measurement and comparison circuits built into the source housing.

Generate irradiance levels from six to 30 meters, or uniformly illuminate areas 46 cm or more in diameter. Source calibration is provided at a distance from the exit pupil. Beyond six meters, the source demonstrates point-source characteristics; approximate illuminance and irradiance levels may be generated by the inverse-square law.

Alternately, use the RS-50 uncalibrated for illuminating various materials. Correlated color temperature is set at CIE Illuminant A or 2856 ±20 K. The illumination area is easily varied by changing the field-aperture stop.