"Mark Lloyd" wrote in message
...
On 12/19/18 12:03 PM, Clark W. Griswold wrote:

[snip]

The trouble is I want to compare 2kHz+ from one light with 2kHz+ from a
neighbouring light and see if they're in sync.

Maybe use a dual trace oscilloscope?

And you'd have to isolate the lights from each other.

Since this landed in alt.home.repair, I gotta ask. Do you have
single-phase or two-phase?

Normally, neighboring lights would be powered from the same phase.

Mine arent and that is deliberate so that if I lose a single phase, and
that isnt that uncommon, I don't lose all the lights in the one area.