When you can only see the tunnel at the end of the light
Lights out, party over, it's the end of your life

from The Roots (Ft. Dice Raw & Phonte) – Now or Never Lyrics on Rap Genius

Meaning

“Seeing the light at the end of the tunnel” is a commonly used expression meaning to see a positive end to a negative situation. Phonte turns the expression on it’s head and comes out with a depressing line

This is perhaps a dismissal of the rest of verse, as in he’s saying, “if you think as negatively as the way I’ve described in this verse, you might as well be dead”

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