Flickering light script in unity 3D.

FlickeringLightScript.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class FlickeringLightScript : MonoBehaviour {

	Light testLight;

	public float minFlickerTime = 0.1f;
	public float maxFlickerTime = 0.04f;

	public float LightIntensity = 20f;
	// Use this for initialization
	void Start () {
		testLight = GetComponent<Light> ();
	
		StartCoroutine (Flashing ());
	}

	// Update is called once per frame
	void Update () {

	}


	IEnumerator Flashing(){
		while (true) {
			yield return new WaitForSeconds (Random.Range(minFlickerTime,maxFlickerTime));
			testLight.intensity = Random.Range(minFlickerTime,maxFlickerTime) * LightIntensity;
			testLight.enabled = !testLight.enabled;

		}
	}
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class FlickerLight : MonoBehaviour
{
	Light myLight;

	float maxIntensity = 80.0f;
	float minIntensity = 20.0f;

	void Start()
	{
		myLight = GetComponent<Light>();
		StartCoroutine(Flicker());
	}

	IEnumerator Flicker()
	{

		float t = 0.0f;
		float duration = Random.Range(0.06f, 0.3f);
		float currIntensity = myLight.intensity;
		float targetIntensity = (currIntensity > 50.0f) ? minIntensity : maxIntensity;
		float variation = Random.Range(-20.0f, 20.0f);
		targetIntensity += variation;

		while (t < duration)
                {
			myLight.intensity = Mathf.Lerp(currIntensity, targetIntensity, t / duration);
			t += Time.deltaTime;
			yield return null;
                }

		StartCoroutine(Flicker());
	}
}