A bit of an update for todays modern times and maybe some corrections. Light house beacons a few at a time, are being converted to flashing LEDs, especially the off shore and other remote ones. This reduces greatly maintenance and procuring obsolete parts. LEDs are highly direction, so the do not need a rotating reflector necessarily. This also reduces power requirements. Add to that, cheaper solar energy systems. This is also true of some channel marker lights Second, some light houses are huge. The Cape Hatteress light is big enough to have special climbing days. Some lights do now flash.
I now, and have for over fifty years, lived by the Norfolk (Virginia, East Coast U S) and can read nautical charts, The Thimble Shoals Light is visible across the channel from Ocean View Beaches. I am a retire electrician with a good electronics back ground.