Decreasing Light Source

I am making a game where you have a flashlight, and the light slowly gets darker and darker until you can't see anything and the light has to charge up. I made some code and I tried it. But it doesn't work the way I want it to. I want it to change by a little bit every 0.25 seconds, but this changes WAY to fast. Could someone tell me what's wrong with my code?

 using System.Collections;
 
 using System.Collections.Generic;
 
 using UnityEngine;
 
 
 
 public class FlashlightBattery : MonoBehaviour
 
 {
 
 public Light light;
 
 
 
 public float maxLight;
 
 private float currentLight;
 
 
 
 void Start()
 
 {
 
 currentLight = maxLight;
 
 }
 
 
 
 void Update()
 
 {
 
 StartCoroutine(Light());
 
 }
 
 
 
 IEnumerator Light()
 
 {
 
 if(currentLight != 0)
 
 {
 
 for(int i = 50; i != 0; i--)
 
 yield return new WaitForSeconds(0.25);
 
 currentLight = currentLight - 0.01f;
 
 light.intensity = currentLight;
 
 }
 
 else
 
 {
 
 Debug.Log("No Light");
 
 }
 
 }
 
 }