It is a susceptibility test and the product starts to be affected by the RF at 80Mhz and 300Mhz.We are not sure but we think the cables inside the luminaire are being affected by the RF, though the flickering is visible. We think that the PWM cables that are inside the lamp are picking noise and affecting the behaviour of the external PWM tool. I don't know what type of filter would stoip that from happening, that is why I think we could fix it by covering the PWM cables.