3 ms·

Are they all intermittent? https://www.youtube.com/watch?v=PLHJ7WnXbDc https://www.youtube.com/watch?v=PLHJ7WnXbDc

• sfall 13y ago
  yes the flash on and off, for fire alarm notification device, they are powered by a direct current circuit that also requires battery backup having a constant state light would put a larger load for no gain. Also it be more like emergency lighting not a notification appliance