Save this to your custom actions folder.
The action requires a 2d light (this won't work with 3d lights). To learn more about Unity's new 2d lighting system, see here:
You also must provide a float to set the intensity. You can set the intensity to 0 to turn the light off.
This script can probably be extended to cover adjusting all the options in a 2d light.
NOTE: When copying the script, it's essential you copy the following line:
using UnityEngine.Experimental.Rendering.Universal;
using UnityEngine; using System; using UnityEngine.Experimental.Rendering.Universal; #if UNITY_EDITOR using UnityEditor; #endif /* By Meffy1122 * Custom action to * Change 2d light intensity. */ namespace AC { [System.Serializable] public class ChangeLightIntensity: Action { // Declare variables here public float intensity; public Light2D light; public float intensityField; public ChangeLightIntensity() { this.isDisplayed = true; category = ActionCategory.Custom; title = "Change light intensity"; description = "Changes light intensity"; } override public float Run() { light.intensity = intensityField; return 0f; } #if UNITY_EDITOR public override void ShowGUI() { light = (Light2D)EditorGUILayout.ObjectField("Light to affect:", light, typeof(Light2D), true); intensityField = (float)EditorGUILayout.FloatField("New light intensity:", intensityField); AfterRunningOption(); } #endif //end the action } }