"I was on a tripod, with a 200mm lens stopped down to F16, and the one you see here was shutter open for 2 minutes and 30 seconds using Kodachrome 64. I tried several time exposures as it was all guesswork and this was the best outcome. The light and color of the sky is a result of the long exposure. There is no light inside the cenograph, so after I opened the shutter, I trotted down, and while continuously moving so I didn't leave a shadow, I fired a hand held flash unit set for the correct distance repeatedly around the arch and on the stone in the center behind the flowers."You can go and see the finished result by clicking the quoted text.
Here's a video that shows some light painting in action. (I don't know anything about the dude who made the video, but it's illustrative of the technique.)
