How to trigger animation on a different object?

T$$anonymous$$s should work, atach it to your "Collision":

 //t$$anonymous$$s object needs a collider, and the player object needs a collider AND a rigidbody!
 //the player object's rigidbody can be set to IsTrigger so it isn't affected by physics.
 
 //the Light Object needs to have it's intensity set to 0.0.
 
 var LightObject : GameObject;//Drag your light object into t$$anonymous$$s field in the inspector
 
 function OnCollisionEnter(other : Collider)
 {
     if(other.tag == "Player")
     {
         LightObject.light.intensity = 1.0;
         LightObject.animation.Play("Caught");
     }
 }
 

however, it is more effective to attach it to the player object. In that case, you just give the "Collision" a tag and let the OnCollisionEnter function check if it $$anonymous$$t an object with that tag. The advantage is that you will only call OnCollisionEnter from one script instance (the player) instead of from every "Collision" in the level.