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Goniophotometric Measurement System GP series

To measure the angular distribution of luminous intensity to evaluate the goniophotometric characteristics


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  • Goniophotometric measurement for LED luminaries up to 2400mm.
  • Spectral distribution at each angle by controlling two-axis goniophotometer automatically to obtain total luminous flux with zonal spherical function.
  • Goniophotometric measurement for large displays.
  • Wide dynamic range with brand-new detector.
  • Complying with IESNA LM-75 and CIE121
  • Usable for both Type B and Type C.
  • Goniophotometric measurement at both UV and NIR region (Spectral radiant flux calculation available)


Measurement Item
  • Angular distribution (Light distribution)
  • Spectral radiant flux (Spectrum)
  • Chromaticity (u,v)   〔CIE 1960UCS〕
  • Spectral radiant intensity (Spectrum)
  • Chromaticity (u’,v’) 〔CIE 1976UCS〕
  • Chromaticity  (x,y) 〔JIS Z 8724〕
  • Dominant wavelength and Excitation purity 〔JIS Z 8701:1999〕
  • Correlated color temperature and Duv 〔JIS Z 8725〕
  • Color rendering index (Ra, R1~R15) 〔JIS Z 8726〕




Model GP-500 GP-1100 GP-2000
Optics Two-axis goniometer
TypeC TypeC TypeB/C
Optical path length < 500mm 500~1500mm 1500~12000mm
Measurable sample LED chip General lightning
General lightning
(Incl. fluorescent tube)
Detector Array spectrometer
Wavelength 360nm~830nm *2
Measure Item ・Angular distribution (Light distribution)
・Spectral radiant flux (Spectrum)
・Chromaticity (u,v)   〔CIE 1960UCS〕
・Spectral radiant intensity (Spectrum)
・Chromaticity (u’,v’) 〔CIE 1976UCS〕
・Chromaticity (x,y) 〔JIS Z 8724〕
・Dominant wavelength and Excitation purity 〔JIS Z 8701:1999〕
・Correlated color temperature and Duv 〔JIS Z 8725〕
・Color rendering index (Ra, R1~R15) 〔JIS Z 8726〕

*1 Corresponding with LM-75 for IESNA *2 Wavelength for detecter can be adjustable


Types of coordinate system in light distribution measurement (JIS C 8105-5)
Coordinate system Angle of inclination
against polar axis
  (Vertical angle)
Angle of inclination
where the polar axis is
made a rotating center.
(Horizontal angle)
Mark Range Mark Range
αβ α -90° ≦ α ≦ 90° β -180° ≦ β < 180° Type B
θφ θ 0° ≦ θ ≦ 180° θ 0° ≦ φ < 360° Type C






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