Error : Unknown identifier : FlashLight

Hello, I recently created a life script of the battery of my lamp. Here it is :

 #pragma strict
 
 
 var flashLight : Light;
 
 function Start ()
 {
     flashLight.GetComponent.<Light>().enabled = false;
     flashLight.GetComponent.<Light>().intensity = 8;
 }
 
 function Update () 
 {
     if(flashLight.GetComponent.<Light>().enabled == true)
     {
         flashLight.GetComponent.<Light>().intensity -= 0.1 * Time.deltaTime / 5;
         Debug.Log(flashLight.GetComponent.<Light>().intensity);
     }
 
 
 }

I then downloaded a script on the Internet that allows to collect batteries, but I can not start the game because of the error: Unknown identify FlashLight.

 var buttonInRange;
 var buttonActivated;
 var batterySound : AudioClip;
 private static var batteryPower : float = 10;
 
 public var guiSkin : GUISkin;
 
 private var hasPlayed = false;
 
 function OnTriggerEnter (c : Collider)
 {
     buttonInRange = true;
 
 }
 function OnTriggerExit (c : Collider)
 {
     buttonInRange = false;
 
 }
 function OnGUI ()
 {
     if(buttonInRange == true)
     {
         GUI.skin = guiSkin;
         GUI.Label (Rect (Screen.width/2-50, Screen.height/2-55, 120, 50), "Pick up batteries");
     
     }
 
 }
 function Update ()
 {
     if (buttonInRange == true)
     {
         if (Input.GetKeyDown ("e"))
         {
             if(!hasPlayed)
             {
                 AudioSource.PlayClipAtPoint(batterySound, transform.position);
                 Flashlight.AlterEnergy(batteryPower);
                 Destroy(gameObject);
                 hasPlayed = true;
             
             }
         
         }
     
     }
 
 }

I think we should add a variable but I do not know which. Thank you.