FGC100 Calibration Unit

The FGC100 calibration standard is a current and temperature stabilized LED source designed to calibrate the FluxGage system. The FGC100 includes a lamp unit and a controller unit. The FGC100 lamp unit emits at 2pi geometry. The FGC100 lamp unit is mounted on the FluxGage for calibration. A special fixture in the FluxGage cover ensures repeatable mounting and calibration.

The FGC100 is calibrated at Ophir from a NIST traceable calibration standard.

As the FluxGage system was design specifically to measure LED luminaires, by calibrating the FluxGage with an LED standard, rather than with a tungsten standard, several major calibration uncertainty contributors are avoided:

  • Spectral mismatch between tungsten and LED sources
  • Angular distribution mismatch between tungsten and LED sources
  • Excess infra-red radiation emitted by tungsten sources, which contributes to stray light in spectrometers

Put simply: If you are going to measure LEDs, best to calibrate with an LED!


Parameter Value
Operation ambient temperature range [°C] 15-30
Stabilization time [minutes] 30
Power consumption [W] 30
LED Unit
Dimensions (LxWxH) [mm] 94 x 154 x 163
Weight [Kg] 0.955
Spectral range [nm] 390-800
Luminous Flux [lumens] 1000
Radiant Flux [W] 4
Working time before new calibration [Hours] 50
Flux Stability over working time ±1%
Control Box Unit
Dimensions (LxWxH) [mm] 184 x 92 x 63.5
Weight [Kg] 0.535
Compliance CE
Part number 7Z17040

Frequently Asked Questions

  • Besides FluxGage, can the FGC100 be used as a separate calibration source for calibrating integrating spheres?
    Absolutely! The FGC100 is delivered with a calibration certificate traceable to NIST and can be used for stand-alone calibration of integrating spheres for general purpose photometry. Contact Ophir for additional information.
  • Why should I calibrate with a LED calibration unit instead of a Tungsten calibration standard?
    Any measuring instrument designed for measuring LEDs should be calibrated with a similar LED. The optimal calibration source is the one that matches the spectral distribution of the DUT (Device under Test) as closely as possible. By calibrating with an LED-based calibration source instead of a Tungsten-based one, you can ensure the best accuracy and reproductibility. Moreover, stray light effects are greatly reduced since the LED has minimal infrared content in the spectrum.
  • What are the benefits of calibrating with the FGC100 instead of with another LED-based calibration standard?
    The FGC100 calibration unit is the first calibration source available in the market that uses a high power white LED (> 1000 lumens) for calibration. Calibration with a high power LED is highly beneficial when measuring high power luminaires (1000 to 40000 lumens). Thanks to a precision electronic loop for active stabilization of LED drive current and smart thermal management, the FGC100 achieves a high level of accuracy and repeatability in the measurements.
  • Is performing a FluxGage calibration with the FGC100 complicated?
    It is actually very easy:

    • There is a dedicated opening in the FluxGage top cover for attaching the FGC100.
    • The FluxGage software has a “Calibration” screen.
    • Follow the instructions in the FGC100 manual.
  • How long does the FluxGage calibration take?
    With the FGC100, the calibration can be done directly on the production floor, on the FluxGage unit itself; no need for long laboratory calibration procedures with integrating spheres. The calibration itself takes only a few minutes.
  • Can I use a Tungsten Calibration standard to calibrate the FluxGage?
    Ophir recommends using the FGC100 calibration unit. The FGC100 was specially designed and tested to quickly and accurately calibrate the FluxGage for NIST traceable performance.