Dance Party and Stage lighting effects?

MissMacchiato

Bring on the Sweet, Sweet Coffee
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I'm having a mental blank. Does anyone know what that type of lighting is called that is often used at dance parties, the one that would give the average person a seizure? it flickers black and white, kind of.

I remember my sister was "Aunt Em" in a stage production of the Wizard of Oz and it was used in the hurricane scene, and I want to describe it in my WIP, but I've forgotten the effect name :(