[Lurker]

Move one of the lights and I think you'll find the problem disappears.

L

[RangerM]

Not sure I follow you.

I have been careful to make sure that the bulbs are away from the sensor (due to the heat), nor do the fixtures shine on each other (opposite corners).

The woods are more than 100 feet from the rear of my house, so there are no reflections possible that could create a false alarm.

Is that what you were referring to?

Thanks in advance.

[Rapscallion]

One infra-red sensor may be picking up the heat from the other floodlight. They are probably keeping each other triggered. Yes, moving one light will probably do it...or even placing a metal panal between them so they cannot sense each other's heat.