disco effect
n.— «Wind energy’s antagonists, meanwhile, are hoping that through petitioning, legal challenges, and political influence their voices will be heard. It is the local issues—the hum of the turbines, the flashing red lights on blades that creates a “disco effect”—that have most activists riled.» —“As windmills spread, some Germans balk at ‘asparagus fields’” by Charles Hawley Christian Science Monitor May 5, 2004. (source: Double-Tongued Dictionary)