Flash light toggle problem

so i wrote this out but having a few problems when i turn the flashlight on it flickers when i try to toggle it on, and its a 50/50 chance that it will stay on, any ideas how i could correct it so its either on or off with out the flickering?

thanks

using UnityEngine; using System.Collections;

public class FlashLight : MonoBehaviour {

 private bool FlashLightOn = false;

     // Use this for initialization
 void Start () {
 
 }
 
 // Update is called once per frame
 void Update () {
 if(Input.GetKey("x") && FlashLightOn == false){
         FlashLightOn = true;
         light.intensity = 2;    
         
     }
         else if(Input.GetKey ("x") && FlashLightOn == true){
         FlashLightOn = false;
         light.intensity = 0;
 }

} }