This prevents blackout conditions during major events such as an earthquake.

At 23:14, Muirhead-Gould ordered all ships to observe blackout conditions.

It was a still night, and Ray watched the silent heat lightning violate the blackout conditions along the coast.

The date of this particular incident (7 Dec. 1942) suggests that he may have been walking in the dark under wartime blackout conditions.

From this point on, the strictest blackout conditions are observed.

With the blackout conditions, we are forced to rely on passive sensor systems only.

Coltart's parents died in a train wreck under blackout conditions that year on their way to visit their daughters.

The operation was conducted under total blackout conditions, using night vision goggles, 35 minutes after the opening parachute assault.

They were also accustomed to working in the "blackout" conditions of the river.

This works on a mirror projection system, more effective in blackout conditions.