These have been replaced by high intensity white strobe lights flashing at a uniform rate of between 1 and 2 flashes per second, in some cases this requires electronic synchronization of appliances supplied from different sources.
These have been replaced by high intensity white strobe lights flashing at a uniform rate of between 1 and 2 flashes per second. This was in some cases. This requires electronic synchronization of appliances. These appliances are supplied from different sources some cases.