Task Closet Rod

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eds

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Installed a Task LED Closet Rod a couple of weeks back on an existing ( 6 year old ) arc fault protected circuit GE brand, closet already had a functioning fluorescent fixture controlled by a single pole switch. After installing, switched was turned on and everything seemed fine, moved on to another task of installing a occ sensor switch for a light in the upstairs hall. Original occ sensor was replaced and power was restored, but the arc fault breaker controlling the occ sensor would trip after 30 seconds or so, if i turned of the closet rod switch breaker would hold. Occ sensor and closet rod are on two separate arc fault breakers, so we left closet rod off until today. Took a new arc fault breaker and a ground fault breaker with me, actually thought wiring might be crossed some where so installed GFI breaker first, it held along with the arc fault breaker for the closet rod. Changed GFI breaker out for new combination arc fault and it held as well, along with the closet rod arc fault breaker.

Question, what could be the cause of the closet rod fixture causing a un-associated breaker to trip, no cross in the wiring of the two circuits.
Breakers were on different phases, so I put them on the same phase to no avail.
New arc breaker stayed on the rest of the day, but I would still like to know what might be the root cause
 
An AFCI breaker is looking for a particular waveform at high frequency combined with current above a threshold.
That waveform could leak over to other circuits, and if the other circuit is carrying more than the series arc threshold of about 8 amps that breaker will trip.
A parallel arc signature, OTOH, cannot trip another breaker because the parallel arc threshold current is far above normal circuit current.

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