Add update script

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Editor/HDRenderPipelineMenuItems.cs

 
     public class HDRenderPipelineMenuItems
     {
+        [MenuItem("Internal/HDRenderPipeline/Upgrade Scene Light Intensity to physical light unit", priority = CoreUtils.editMenuPriority2)]
+        static void UpgradeLightsPLU()
+        {
+            Light[] lights = Resources.FindObjectsOfTypeAll<Light>();
+
+            foreach (var l in lights)
+            {
+                var add = l.GetComponent<HDAdditionalLightData>();
+
+                if (add == null)
+                {
+                    continue;
+                }
+
+                // We only need to update the new intensity parameters on additional data, no need to change intensity
+                if (add.lightTypeExtent == LightTypeExtent.Punctual)
+                {
+                    switch (l.type)
+                    {
+                        case LightType.Point:
+                            add.punctualIntensity = l.intensity / LightUtils.ConvertPointLightIntensity(1.0f);
+                            break;
+
+                        case LightType.Spot:
+                            add.punctualIntensity = l.intensity / LightUtils.ConvertPointLightIntensity(1.0f);
+                            break;
+
+                        case LightType.Directional:
+                            add.directionalIntensity = l.intensity;
+                            break;
+                    }
+                }
+                else if (add.lightTypeExtent == LightTypeExtent.Rectangle)
+                {
+                    add.areaIntensity = l.intensity / LightUtils.ConvertRectLightIntensity(1.0f, add.shapeWidth, add.shapeHeight);
+                }
+                else if (add.lightTypeExtent == LightTypeExtent.Line)
+                {
+                    add.areaIntensity = l.intensity / LightUtils.calculateLineLightArea(1.0f, add.shapeWidth);
+                }
+
+                EditorUtility.SetDirty(add);
+            }
+        }
+
         [MenuItem("Internal/HDRenderPipeline/Add \"Additional Light-shadow Data\" (if not present)")]
         static void AddAdditionalLightData()
         {