This lamp is flashing a light outside the alley door, to bring them in here.

As such, the lamps would flash either 110 or 440 times per second in the above examples.

Charlie restored the plug, and the lamp flashed on again.

His lamp flashed down and lost itself in the darkness below.

The lamps flashed on as night closed down.

The water here was dark, but the lamp flashed from the sides of fish fluttering like pennants in a breeze.

"Does that mean they've changed their mind and they..." A second lamp flashed, followed quickly by a third.

A lamp flashed on the cabinet and a warning device gave a harsh buzz.

But not a single lamp flashed on the control panel.

"You see the image because all the lamps are flashing on and off so quickly."