The Self-Luminosity of Mind

There is a great master, Chitsukha Acharya, who lived about 700, 800 years ago. He wrote a book called Tatva Pradhi Pika, the lamp-illumining reality. It's on Advaita Vedanta and I have studied just one page of it. And he has a definition of suphrakash, a self-luminosity. You wouldn't believe it. He takes up 10 definitions, rejects each one,. then comes to the 11th definition, and the bitchy accepts. What is self-Luminosity? Please define the opponent's asks. Then one by one, they're taken up.