There is an inner-light and an outer-light. Inner-light is the light perceived by you as your insight which includes what you can see in sleep. The inner-light is linked to your imaginations, ideas, and thoughts. The outer light is the unmistakable sunshine that you see and feel on your skin when you are fully awake. This is my simplified version of entry into a long lasting debate of philosophers over objective or subjective reality of the world.

This is a tool to tear apart the newspapers that cover our windows.

Behind the meaning of light, lies the meaning of your reality. Most often, in philosophical traditions, the light is associated with Truth.