Great write up from the great Allan Hoffman!
http://www.mrilightpainting.com/lightbomber/
LightBomber lets you create light paintings with your iPhone camera
I’ve loved creating light paintings with cameras ever since I was a 15-year-old with a Konica T4. My friend Scott and I would light sparklers and leave the shutter open on my Konica to produce these wonderful-looking images. I can still remember the thrill of seeing those photos, with their ethereal light trails, coming back from the photo lab. We’d use flashlights of various types, lamps, fireworks — just about anything to paint with light.
But with the iPhone? It’s not so easy. But now there’s LightBomber, an app that’s devoted to creating light trails and light graffiti. I’m just starting to experiment with it, but it is very, very cool, and I’m looking forward to seeing what iPhoneographers do with it.