How it Works – FluxGage Technology

FluxGage is a completely new way to measure LED luminaires.

The integrating sphere is the standard instrument for measuring flux and color of LED lights.  It uses a white diffusive coating on its interior to redirect a known portion of the light to a detector.  However, the integrating sphere must be at least three times the size of the device under test (DUT).  Additionally, the integrating sphere must be recalibrated for each use to take into account the absorption of the DUT itself.


FluxGage uses the opposite approach: Detection surfaces which absorb and detect light.  Eliminating reflections allow the device to be the size of the DUT, rectangular, and calibrated only once.

The detection surface should have these properties:

The FluxGage detection surface is made of solar panels to detect light, a sheet diffuser to make the panels insensitive of angle and a dense array of pinholes printed with black ink over the diffuser. This arrangement ensures all three requirements.


The FluxGage system has a photodiode to measure flicker and a spectrometer for color parameters (CCT, CRI, chromaticity, etc.).


For more information about the FluxGage technology, including an analytical model of total flux measurement, error analysis, and experimental results, read the white paper written by Dr. Efi Rotem:

“FluxGage” A Photometric Test System for LED Luminaires Based on Solar Panels

The white paper was presented at the LED professional symposium + expo, LpS 2016, Bregenz, Austria