GP series

Goniophotometric tester(far field)

GP series


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GP series Goniophotometric tester(far field)

GP series measure the angular distribution of luminous intensity to evaluate the goniophotometric characteristics.


#LMT, light distribution

 Features  
  • Goniophotometric measurement for LED luminaries up to 2,400mm

  • 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

  • Both Type B and Type C are available

  • Goniophotometric measurement at both UV and NIR region(spectral radiant flux calculation available)

 Specifications 
ModelGP-500GP-1100GP-2000
*Opticstype Ctype Ctype B, type C
Optical path length< 500mm500 ~ 1,500mm1,500 ~ 12,000mm
Measurable sampleLED chipgeneral lighting modulegeneral lighting
incl. fluorescent tube
Detectorarray spectrometer
Wavelength**360 ~ 830nm

*two-axis goniometer

**wavelength for detector can be adjustable



Types of coordinate system in light distribution measurement(JIS C 8105-5)

Coordinate
system
Vertical angleHorizontal angleIESNA LM-75
MarkRangeMarkRange
αβ
α
-90° ≦ α ≦ 90°
β
-180° ≦ β ≦ 180°
type B
θφ
θ
0° ≦ θ ≦ 180°
φ
0° ≦ φ ≦ 360°
type C



 Measurement 
Measurement items
  • 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〕


 System configuration