Autonomous and efficient light meter

LEDs street lights become less efficient during their lifetime. Different mechanisms are embedded inside the street lights to ensure the light flux is less impacted by aging. Nevertheless, these processes are not disclosed, customers face a black box. The current solution is to trust the manufacturers about the LED light flux losses of their products or to schedule heavy and costly manual measurements to measure the light flux of street lights at specific timing. The objective of this master thesis is to find a way to precisely measure light flux variation during the lifetime of street lights to highlight abnormalities in terms of light flux losses. In particular, the solution should detect when the residual light flux goes under a specific threshold compared to to the initial state. The solution proposed in this master thesis is to develop a dedicated device to this purpose. The device should be autonomous, in terms of energy supply and in terms of maintenance, connected and efficient. The result of this development is a 10,5cm2 prototype able to measure the light flux variation of a street light with a small error tolerance of 3%. The device is autonomous and communicates wirelessly.