From Rangjung Yeshe dictionary: Luminosity ('od gsal). A key term in Vajrayana philosophy signifying a departure from Mahayana's over-emphasis on emptiness which can lead to nihilism. According to (Great) Mipham Rinpoche, 'luminosity' means 'free from the darkness of unknowing and endowed with the ability to cognize.'
Luminosity is the uncompounded nature present throughout all of samsara and nirvana.
Chinese calligraphy: Luminosity 明. The word itself is composed of Sun and Moon put together. Sumi ink on raw silk, mounted on acid-free fabric on board (archival); ready to hang. The size is 9 by 11 inches.