I’d venture to say that most people, if given an option, would choose to walk into an unfamiliar room with the a light on, not off. 

Some benefits of the light are: safety, guidance, perception, etc. 
The Word is referenced as a lamp and a light for the path ahead. When we apply the Word to our lives we gain similar benefits to a regular light. The Word points out danger. It offers wisdom. The Word helps us to see what it truly going on around us.
Be sure to turn your light on by meditating on the scripture throughout the day. 
Scripture taken from: Psalm 119:105