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In a scientific sense, I would define motion as velocity. Now, as you know, velocity implies momentum, which can be transfered between objects. So something is actually moving if it can impart momentum to other objects. Stick your hand between two of the lights, and see if you it starts to move when the "motion" of the lights "hits" your hand. Your hand didn't move? Then the light wasn't really moving.
Think of it this way - when you watch TV, people "move" all the time, but they aren't really moving. It's just the pixels on your tv changing colors. It's just a perception of motion.
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