nice research on the history of light painting by LPWA

"Painting with light as a process was born together with photography. More precisely - photography was originally images drawn by sunlight! The very name of the first imprinted images attests to this - they were called "heliography" that is literally "painted the sun." The author of these heliographs was Joseph Nicéphore Niépce (France), and the first heliograph in the world was made on a plate of lead with pewter fusion in 1826." 

CLICK FOR PART ONE of the full report thanks to LPWA.