Back in the late 60's I worked on a program at General Electric, Utica, NY called LAMPS. The technology consisted of very bright strobe lights flashing in the 8 Hz - 10 Hz region. These lights were flown in aircraft and used in the Vietnam war to disorient the enemy. The strobe frequency is unique in that it disrupts brain wave activity that caused the enemy target to loose control of bodily functions (not just vomiting).
We did our testing at night and the lights could be seen from a nearby highway. This resulted in multiple auto accidents.