I will be fitting these, eventually, to my aircraft. They are very, very popular on the Eurfox (A220) and I have not heard one mention of interference:

Whelen Strobes

Easy install and no boxes to build up enough ummphh for a flash.

I was originally going to use a 3 core shielded cable (power, ground, synch) but following the advice below (from AeroLED) I'm now going to use 2 core, with the shield being used as a ground return. I wasn't even considering using the shield for this purpose but it seems the LED engineer-types reckon it's a good idea and helps eliminate noise:


How To Minimize Strobe Noise

LED strobes operate differently than legacy Xenon strobes.

Legacy Xenon strobes use a flash capacitor that charges up continuously between flashes, pulling a steady amount of current, then dump the charge to the Xenon tube in a single burst.

LED strobes pull their current while the strobes are lit, and pull nearly zero current between flashes.

As a result, the way that the LED strobes are wired will make a huge difference in whether or not audio frequency noise gets into your intercom. Because the current pulses to LED strobes flow in a loop with the outgoing current flowing in the outbound power wire, and the return current flowing in the ground path, there is the potential for the wiring to create time varying magnetic fields that can couple into adjacent wires such as headset jack cables, or even your antenna coax cable.

To prevent this, it is highly recommended that you follow the following wiring recommendations:

1. Use shielded wire, AeroLEDs has 3 conductor 20 gauge shielded wire available for this purpose.

2. Use the shield as the ground return. When the ground current flows immediately adjacent to the power wire, the magnetic field produced by the power wire current is canceled out by the current flowing in the shield. The ground current prefers to stay in the shield rather than flow through structure because generating a magnetic field takes energy, and the current wants to follow the path that takes the least effort because the fields cancel out (called the path of least inductance).

3. Bring the shielded wire run all the way to the panel, where the power wire can go to the switch, and the shield ground can be run to the behind the panel grounding block. If you need to break the wire run at the wing root with a connector or terminal block, that is OK as long as you resume the shielded wire in the fuselage and connect the shield grounds through the interconnect.

4. As much as possible, keep some separation between the strobe wires and sensitive cables such as intercom audio cables, headset jack cables, or antenna coax for the radios.