Dark green represents stand your ground by statute states.
Light green represents stand your ground by judicial decision or jury instruction.
Blue represents duty to retreat.
Yellow represents middle-ground.
That weird light blueish color represents duty to retreat except for home invasions.
The dark green states are the only places that I will ever agree to live in.
Light green opens a wider door for the state to drag you though the mud and destroy your life if you use a gun in self-defense than the dark green states.