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diff --git a/src/Editor/Language/Def/Intellisense/ILightBulbSession.cs b/src/Editor/Language/Def/Intellisense/ILightBulbSession.cs
new file mode 100644
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+++ b/src/Editor/Language/Def/Intellisense/ILightBulbSession.cs
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+// Copyright (c) Microsoft Corporation
+// All rights reserved
+
+using System;
+using System.Collections.Generic;
+using Microsoft.VisualStudio.Text;
+
+namespace Microsoft.VisualStudio.Language.Intellisense
+{
+    /// <summary>
+    /// Defines a Light Bulb session, which encapsulates all the information about a particular Light Bulb instance.
+    /// </summary>
+    [CLSCompliantAttribute(false)]
+    public interface ILightBulbSession : IIntellisenseSession
+    {
+        /// <summary>
+        /// Determines whether the session is in the collapsed state.
+        /// </summary>
+        bool IsCollapsed { get; }
+
+        /// <summary>
+        /// Determines whether the session is in the expanded state.
+        /// </summary>
+        bool IsExpanded { get; }
+
+        /// <summary>
+        /// Tries to get the list of <see cref="ISuggestedAction"/>s (grouped into <see cref="SuggestedActionSet"/>s)
+        /// this session displays.
+        /// <param name="actionSets">Resulting list of <see cref="SuggestedActionSet"/>s.</param>
+        /// <returns><see cref="QuerySuggestedActionCompletionStatus"/> indicating whether the operation completed successfully
+        /// or was canceled.</returns>
+        /// </summary>
+        /// <remarks>Note that this method is intended to be called in response to a user action (such as Light Bulb expansion)
+        /// and will show a wait dialog if it takes too long to complete.</remarks>
+        QuerySuggestedActionCompletionStatus TryGetSuggestedActionSets(out IEnumerable<SuggestedActionSet> actionSets);
+
+        /// <summary>
+        /// Expands the session.
+        /// </summary>
+        void Expand();
+
+        /// <summary>
+        /// Resets the session content.
+        /// </summary>
+        void Reset();
+
+        /// <summary>
+        /// Fires when the session is collapsed.
+        /// </summary>
+        event EventHandler Collapsed;
+
+        /// <summary>
+        /// Fires when the session is expanded.
+        /// </summary>
+        event EventHandler Expanded;
+
+        /// <summary>
+        /// Determines whether this session tracks the mouse.
+        /// </summary>
+        bool TrackMouse { get; }
+
+        /// <summary>
+        /// Gets the visual span to which this session is applicable in the text buffer. This is used to position the Light Bulb presentation
+        /// that is rendered by Light Bulb presenters.
+        /// </summary>
+        /// <returns></returns>
+        SnapshotSpan ApplicableToSpan { get; }
+
+        /// <summary>
+        /// Gets a set of suggested action categories this session was requested to provide.
+        /// </summary>
+        ISuggestedActionCategorySet ActionCategories { get; }
+    }
+}