React to an UndeadStim stimulus by adjusting the Renderer\Dynamic Light proportional to the intensity of the stim. The Script\Timing property controls how long a stim will be effective, during which any lower stims will be squelched.
The UndeadStim stimulus is like a PingStim for undead AI. The script reacts to stimulus values less than 0. It expects the object to emit positive-valued stims that are reflected by the AI.