4 engine ingestions in 5 months
, 3 at night, 1 by day, all with landing lights on might suggest that landing lights are inconsequential to the propensity of birds to fly into the aircraft.
As three of these occurrences were into engine #4, there is a good argument I believe to remove #4 from the wing!
I have seen some aircraft, predoninantly DH8 in FNQ with occulting landing lights. I'd be interested to know if this system has resulted in a reduction in the incidence of bird strikes. I believe the theory is that a bird cannot see an aircraft too well unless there is relative movement, the landing lights occulting supposedly enhances the perception of relative movement.