Darkness represents Spiritual Ignorance, blindness. 

Light represents revelation, knowledge, and clarity.

LIGHT

From Darkness to LIGHT

Darkness

Genesis 1:4 NKJB. "And God saw the light, that it was good; and God divided the light from the darkness."

John 1:5  The Light shines in the darkness, and the darkness did comprehend it.

1 Peter 2:9.  But you are A CHOSEN RACE, A royal PRIESTHOOD, A HOLY NATION, A PEOPLE FOR God's OWN POSSESSION, so that you may proclaim the excellencies of Him who has called you out of darkness into His marvelous light;