(uncountable) The artistic technique of moving a light source to selectively illuminate parts of the subject or scene a camera is recording (at a slow shutter speed), or to shine directly into the camera and in this way sketch.
(uncountable)Camera painting, the artistic technique of moving a camera (while it records at a low shutter speed) such that light sources appear in multiple places or as streaks in the resulting photograph, the "painting".
(countable) A painting created using one of these techniques.
Used other than with a figurative or idiomatic meaning: seelight, painting.
2011, Jo Taylor, Watercolour Wisdom, page 92:
This key has slightly more midtone but is still a light painting.