I hate to respond this, but I cannot allow incorrect information to pass.
Warning, this post contains geek-speak. You do not need to know or understand this material to have success with light animation.
Anyone who has taken more than a basic class in electronic circuits should be familiar with E=I*R, which is sometimes written as V=I*R for strictly DC circuits. Using this formula, it should be obvious that a resistor based voltage divider cannot provide voltage regulation for a variable load. The servo is a non-linear device that draws very little current when stopped, but can draw a significant amount of power when in motion or under load.
If you are thinking about using Thevenin's Theorem, it is only valid for linear circuits.
While you might be able to get away with using very small value high wattage resistors such that the servo current fluctuation would not cause a large voltage swing, it would be a very poor circuit design as you would be wasting a lot of power through the resistors in the divider network.
At a minimum, you will need a power transistor and it would be a good idea to use a Zener diode as a fixed voltage reference. For all of that, it would be easier to just purchase a voltage regulator.
This goes well beyond the technical depth that is needed to be active member of this forum and to create light animation masterpieces.