Further to my comment a couple of days ago about flashing car headlamps at birds to get their attention: a very useful addition to landing lamps is the Pulselite system, which flashes the landing lamps on and off to make the aircraft more apparent. A number of manufacturers have STC'd units, a simple Google will give them.
They are required on contracted fire fighting helicopters here, but I first used them about 15 years ago on a 109. If you have more than one lamp, and they are close together, set them to pulse together rather than alternately. If they are far apart, alternate flashing is best
