ai spot you with flashligt on!!!

You just need your ai to check for the light, is it on.

Does the spotlight have to be facing him? Does the cone of light have to intersect with his model/face? Or is it just proximity-based?

If it's just by proximity, then just use a combination of Vector3.Distance() and Light.enabled to test your light[s].

well what i wanted is when the light is on near him he spots me and charge well im gona show you the Ai script that im using.

 var Distance;
 var Target : Transform;
 var lookAtDistance = 25.0;
 var attackRange = 15.0;
 var moveSpeed = 5.0;
 var Damping = 6.0;
 
 function Update ()
 {
     Distance = Vector3.Distance(Target.position, transform.position);
     
     if (Distance < lookAtDistance)
     {
         renderer.material.color = Color.yellow;
         lookAt();
     }
     
     if (Distance > lookAtDistance)
     {
         renderer.material.color = Color.green;
     }
     
     if (Distance < attackRange)
     {
         renderer.material.color = Color.red;
         attack ();
     }
 }
 
 function lookAt ()
 {
     var rotation = Quaternion.LookRotation(Target.position - transform.position);
     transform.rotation = Quaternion.Slerp(transform.rotation, rotation, Time.deltaTime * Damping);
 }
 
 function attack ()
 {
     transform.Translate(Vector3.forward * moveSpeed * Time.deltaTime);
 }

well the function look at is the object ( i use a capsul )when near the object its façing you. the function attack juste charge to you. and what i was thinking is to add a new function bellow the attack function. but i have know idea how to make it attack on light on.