Street art light?

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So what do you guys think of all this light graffiti happening out there? People making images using long exposure and light sources to make some seriously creative stuff.

But is it Street Art? It exists only as a photo, I can not stumble upon it as I stroll the streets, it only exists in a single instant as the camera captures the moment. How long does it have to exist for before it becomes valid street art? 

Any thoughts people?

Check out some links and let me know what you think in the comments.

Awesome Light Graffiti Pictures from Abduzeedo

More over at Weburbanist

A light spray can to replicate that graf vibe

Yes the title is supposed to be a pun!