The collision is a matter of timing between the first drop and the second drop. The second drop needs to be falling at the precise moment that the first drop is rising back out of the pool so that they collide at or near the apogee of the first drop's rise. Then the flash of course must be timed to coincide with the collision. This is made very easy with the MIOPS Splash device. The system is controlled via bluetooth from a smartphone or tablet. One simply needs to specify the size of droplets (in milliseconds of water flow), the time between the droplets being released (in milliseconds) and the time delay before the flash is fired (in milliseconds). You just need to experiment with the timing until a suitable combination is found. Making minuscule changes in timing can dramatically change the dynamics of the collisions. If you want more details I'd be happy to elaborate further.
The collision is a matter of timing between the first drop and the second drop. The second drop needs to be falling at the precise moment that the first drop is rising back out of the pool so that they collide at or near the apogee of the first drop's rise. Then the flash of course must be timed to coincide with the collision. This is made very easy with the MIOPS Splash device. The system is controlled via bluetooth from a smartphone or tablet. One simply needs to specify the size of droplets (in milliseconds of water flow), the time between the droplets being released (in milliseconds) and the time delay before the flash is fired (in milliseconds). You just need to experiment with the timing until a suitable combination is found. Making minuscule changes in timing can dramatically change the dynamics of the collisions. If you want more details I'd be happy to elaborate further.
Thanks a lot for the info, Nathan. I googled the MIOPS device and will look more into it.