How to activate scripts of other objects in a script?

Question

Programming

The script should work like this, when a certain key is pressed, the Light (Sphere) activation script is triggered, and also when another key is pressed, another Light (Sphere (1)) is activated (the script must be independent of these objects)

Main script code

using UnityEngine;
using System.Collections;

public class TimeLightsScript : MonoBehaviour {
  
  public GameObject[] light;
  private 

  


  void Start () {
    light = GameObject.FindGameObjectsWithTag ("MainLight");
  }
  

  void Update () {
    
  }
}

child object code

using UnityEngine;
using System.Collections;

public class TimeLightsScript : MonoBehaviour {
  
  public GameObject[] light;
  private 

  


  void Start () {
    light = GameObject.FindGameObjectsWithTag ("MainLight");
  }
  

  void Update () {
    
  }
}

PS I don't want to write separate scripts for each object

Answer 1

The script is also a component, therefore:

public class SomeClass: MonoBehaviour {
  private otherSctipt: OtherScript;

  public void Start() {
    otherScript = GetComponent<OtherScript>();
    otherScript.someOtherMethod();
  }
}