is a ball of light continuous

say a point in space gives off a flash of light, and you drew a sphere with a lightyear radius from that point.  does every point on the sphere see that flash of light after a lightyear (in theory, pretend theres nothing between the point and the sphere), or are there areas which would not see the flash because light doesnt come exactly that direction?

ive wondered this ever since i was given the analogy of a ripple in a pond, and how that spreads out pretty uniformly and continuously away from the point.  but ripples get weaker as they spread farther from the center, i mean before they collide with walls or anything, don't they?  i haven't actually seen one propogate long enough to notice.

the relation here i think is that light would have to account for similar loss by not being continuous, or it would need to lose frequency as it got farther out.

>>10

The light becomes less intense as the sphere expands. So the light still hits everywhere on the sphere, just not as brightly. There is no "filling the gaps" required.