The 940 LED-200 Series Goniometer is optimized to provide precise measurement of angle dependent spatial radiation properties of LEDs and small luminaires, accommodating sample sizes up to 200 mm in diameter.

940 LED Goniometers can be combined with a Gamma Scientific Spectroradiometer or UDT Series photometer depending on your specific measurement needs. Combining the goniometer with a spectroradiometer allows for measurement of luminous flux, color coordinates and CRI. Connecting the goniometer to a photometer provides fast measurements of spatial light distribution.


  • Rapid, precise characterization of spatial light distribution
  • Accurate measurement of LED luminaires, lamps and modules
  • Models optimized for specific sample sizes
  • Work seamlessly with our spectroradiometers or photometers to measure luminous flux, color coordinates or CRI
  • Conform with CIE, DIN and IES standards

Precision Solutions for Angle Dependent Spatial Radiation Properties

  • Optimized for precise measurement of LED and LED luminaires
  • Maximum flexibility; can be seamlessly integrated  with our broad range of spectroradiometers and photometers
  • Conform to CIE, DIN and IES standards

Our wide range of light measurement instrumentation is complemented by ISO/IEC 17025 accreditation by NVLAP (NVLAP lab code 200823-0), resulting in unmatched performance, traceable standards and highly precise custom calibration options.



CIE Goniometer Type

 Type C with horizontal optical axis


 Stepper motor

Angular Range C (horizontal) Axis

 ± 360° with end switches

Angular Range Gamma (vertical) Axis

 ± 180° with end switches

Resolution of Angle encoder


Reproducibility of C-Axis

 ≤ 0.1° at maximum sample load

Reproducibility of Gamma-Axis

 ≤ 0.05° at maximum sample load

Angular Speed of C-Axis

 16 speeds (minimum) selectable to maximum 25° / second

Angular Speed of Gamma-Axis

 16 speeds (minimum) selectable to maximum 14° / second

Travel Range Z-Axis

 75 mm

Equipment Setup

 Stable base with integrated controller


483 mm


402 mm


1,750 mm  (including measurement rail)


8 kg


USB for connection to PC

Power Supply

 115 / 230 VAC   50/60 Hz

Power Rating

 120 W max


 0 to 35° C          Relative Humidity 0 to 90% non-condensing


                           Sample Table

Mounting Plate

 160 mm diameter

Maximum Sample Size

 200 mm diameter

Maximum Sample Mass

 0.25 kg

Specifications are subject to change without notice.  

Complete Goniometric Measurement Systems

GS-1220-GONIO-200LED/Luminaire Goniometric Spectral Measurement System, includes GS-1220-1-RM spectroradiometer (360-900 nm, 2.5nm slit setting, with shutter),  2m flexible fiber-optic coupler, Model 18795 Cosine Collector/Fiber Adapter with 1.5 inch sphere, Model 24876 baffle tube, Light Touch LED software, light touch controller, 940LED-200 Bench-top Computer Controller Goniometer, Type C, for use with lamps up to 6-inch max. dimension.