LGS 350 Goniophotometer


The LGS 350 Goniophotometer/Goniospectroradiometer was created to analyze angle-dependent spatial radiation properties. This particular model is best used with small to medium sized SSL luminaries and LED modules. Test specimens operate from a horizontal burning position. Measurements can be taken at an angular range of plus or minus 160 degrees in the gamma theta axis.

When used in conjunction with Instrument Systems spectroradiometer, all spectral quantities such as color temperature, color coordinates and color rendering index are determined as a function of angle. Carry out C-plane measurements very quickly when using the LGS 350 with the Optronik DSP Photometer.

The Complete System: The LGS 350 Goniophotometer comes with a sample plate for securing the test specimen. It also has an LGS Controller that controls the stepper motor and angle display. When a photometer is used with the LGS 350 the LGS controller displays measured values in candela or lux.

PDF Click here for the LGS 350 Brochure.


  • Type C goniophotometer with horizontal optical axis
  • Samples up to 700 mm diameter and 8 kg weight
  • Accurate measurement of luminous intensity distribution and luminous flux
  • Angular-resolved evaluation of spectral and colorimetric quantities
    • Data export in IES and EULUMDAT format


LGS 350 Goniophotometer
CIE goniometer type Type C with horizontal optical axis
Driver Stepper motors
Angular range C axis ± 160° with reset switches
Angular range Gamma axis ± 160° with reset switches
Resolution of the angle encoder 0,01°
Reproducibility C axis ≤ 0,1° (at max. sample load)
Reproducibility Gamma axis ≤ 0,05° (at max. sample load)
Angular speed C axis 16 speeds selectable from 2.5°/s to 36°/s
Angular speed Gamma axis 16 speeds selectable from 1°/s to 18°/s
Clear width C axis - swivel arm 370 mm
Sample table
Maximum sample size 700 x 140 mm² or 640 x 230 mm² or 500 x 500 mm² (in each case for symmetrical mounting)
Maximum sample mass 8 kg