Each and every quantum has a constant amount of action . Double the ball's mass, and you double the action. Or imagine yourself running at a constant rate of energy output. All matter is just a mass of stable light. It is the second universal constant to emerge from modern physics.
Light always comes in identical units of action.
Like relativity, quantum theory also points to light being beyond space and time. We may think of a photon being emitted from some point in space and traveling to another point where it is absorbed. But quantum theory says that we know nothing of what happens on the way. The photon cannot even be said to exist in between the two points. All we can say is that there is a point of emission and a corresponding point of absorption, and the transfer of a unit action between the two.