How to apply effect to all lights simultaneously, not sequentially?

I'm trying to create an effect to apply to all lights to make them flash a few times. I'm using linear, but could do something else. I create the effect and apply to all the lights, but when played back, they play back sequencially. I need them all to change at the same time, ie: all full, then all zero.

Is there a way to do this?

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