Just got done doing a 40 story apartment building in Seattle and now we are having arc fault issues with the LED lights. We have a Siemens arc fault tester hooked up and when each switch is turned on individually it isn't an issue. But as you start to turn more lights on they build and cause interference on the circuit and simulate an arc fault. We have tried everything we can think of including new transformers/dimmers. Trying to see if anyone else has had the same issues or not. The fixtures are not FCC compliant which is a big issue.