I opened the garage doors and turned on a pair of 150-watt incandescent (note INCANDESCENT) floodlights to admire a torrential thunderstorm and newly created river rushing down my driveway. What amazed me most was a strobe effect on some of the raindrops. There was little or no wind, the droplets seemed to fall at 4 different rates. The slowest, presumably smallest, fell only a few feet per second like very fine snow. The next fell at a rate that one could track continuously as it passed through the floodlight beam. Others seemed to draw a line as they passed through the beam similar to a meteor trail. The fastest drew a DIScontinuous line as they passed through the beam. As they passed at about two meters in front of me, they formed a broken line segment about 2 cm bright, 2 cm invisible, exactly as one would observe if they were illuminated by a strobe lamp. The only illumination was the incandescent flood lamps (no dimmer in circuit). The strobe effect seemed only to occur with the fastest (largest?) droplets. I can’t think of anything that would cause this.