Vishnu sahasranamam, slok81

Slok81:      Thejo Vrusho Dyuthidharaha   Sarvasasthra Bhruthaam Varaha
                     Pragraho  Nigraho  Vyagro Neikasrungo GaDaagrajaha

The Brillient Supreme Self resting in Circular formation , the glowing body of Light, the Great Entity consisting  all weapons revolving in it, the one eminates while creation and sucks all  into it at the time of catostraphy , the Sustainer, the Eternal Existance, the  Cosmic Fire with multiple projections, and the  Prime Superior, is sree maha Vishnu.

Once again, in this slok also, the names related to LIGHT are attributed to Vishnu. "Thejo", " Dyuthi"  are the two names, defining Vishnu as "Light form".
This light is not ordinary, it is DEVINE Illumination of the Thrilokas.
This devine golden brightness represents the " Supreme Consciousness ",
VISHNU. 
Vishnu commands the creation, retention and disollution of the universe.
Vishnu performs these three great actions by flashing the cosmic fire in multiple directions. The Cosmic Currents of different frequencies, perform different celestial acts. The word "Neikasrungo" refers to the various spikes of cosmic currents of energy variations.
VISHNU, the President of thrilokas pocesses unimaginable power plays, which are executed in different contexts as per requirement.
That's why Vishnu is named " Jishnu, PrabhaVishnu, Grasishnu, Bhrajishnu,
Sahishnu, corresponding to the context of action.
Ofcourse, it is impossible to describe completely, the Supreme Self, VISHNU.

Om Vishnave namaha