Light on Yoga: Yoga Dipika (Sanskrit: ??? ?????? "Yoga D?pik?") is a 1966 book on the Iyengar Yoga style of modern yoga as exercise by B. K. S. Iyengar, first published in English. It describes more than 200 yoga postures or asanas, and is illustrated with some 600 monochrome photographs of Iyengar demonstrating these.