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I’m a photographer based in Glasgow, Scotland, working with light painting, infrared and alternative lighting. My main areas of expertise are tripping over things in the dark and losing things in the studio, particularly lens caps and torches (although I still maintain that aliens move them when the lights are out).
Light painting uses hand held lights to light the subject during a long exposure. The light is painted into the image in a dark studio. There’s a more comprehensive explanation of the technique here: Tutorial, and a basic intro here: Light Painting.