He was Travelling Light
If you are stuck at a red light, its the time that it takes for the occupant of the car behind you to honk his horn when the light turns green.
You can sleep with a light on.
Dr Whoover
She's afraid they'll bring down the house.
Intersect it with a plane.
Plane.
The guy overpacked, and the photon is traveling light.
Luggage full of goals.
I don't know, but it's probably light-weight