Disable Light,ParticuleSystem and gameobject from the parent?

Hello,Im trying to create a script that will enable a light, a particule System(Or Acces The Emmiter) And a Gameobject wich are child of the gameobject that contain the script.

I got those errors:

1.Cannot implicitly convert type UnityEngine.Transform' to UnityEngine.ParticleSystem' 2.Cannot implicitly convert type UnityEngine.Transform' to UnityEngine.Light' 3.Cannot implicitly convert type UnityEngine.Transform' to UnityEngine.GameObject'

Here's the script:

 using UnityEngine;
 using System.Collections;
 
 public class ItemLightLifetime : MonoBehaviour {
 
     public int LifeTime = 300;
     private GameObject LightZone;
     private Light LightSource;
     private ParticleSystem Particule;
 
     // Use this for initialization
     void Start () {
         SetReferences ();
         InvokeRepeating ("timeisgoingon", 0f, 1f);
 
     }
     
     // Update is called once per frame
     void Update () 
     {
 
     }
 
     void timeisgoingon()
     {
         if (LifeTime > 0) {
             LifeTime -= 1;
         } 
         else 
         {
             TurnOffLight ();
         }
     }
 
     void TurnOffLight()
     {
         if (LifeTime == 0)
         {
             LightZone.SetActive (false);
             LightSource.enabled = false;
             Particule.IsAlive (false);
         }
     }
 
     void SetReferences()
     {
     LightZone = transform.Find ("LightZone");
     LightSource = transform.Find ("LightSource");
     Particule = transform.Find ("Particule");
     }
 
 }