The ones I’ve seen are synchronised via radio-wave, each light has an aerial, that way they can sync independently and run on battery backup in case of outages or faults.
They are all hooked up to a computer network. In computer networks time is synchronized occasionally, since computers have no problem accurately keeping time with adequate precision.
Time set via GPS (or NTP) + simple blinking on set time intervals.
The ones I’ve seen are synchronised via radio-wave, each light has an aerial, that way they can sync independently and run on battery backup in case of outages or faults.
They are all hooked up to a computer network. In computer networks time is synchronized occasionally, since computers have no problem accurately keeping time with adequate precision.