Hi
Maybe they're using a PWM (pulse width modulation) to regulate the current consumtion of LED.
(With that estimated power, linear regulation ist not effective)
Ok, all distributed electrical parts should be confirm with CE, GS, VDE, ... etc.. etc...
IMHO, radio on sea is on the lower band. Let's say, PWM of the LED is at ~5kHz.
Well, some harmonics here and there...
I could believe that interference
Bevore I've done some corrections, you could hear the glowing of floodlights at the booster of my foghorn.
thats nearly the same
Pete