diff --git a/src/HueApi.Tests/LightTests.cs b/src/HueApi.Tests/LightTests.cs
index 2dfb85d..9634fe0 100644
--- a/src/HueApi.Tests/LightTests.cs
+++ b/src/HueApi.Tests/LightTests.cs
@@ -5,6 +5,7 @@
 using Microsoft.Extensions.Configuration;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 
@@ -36,7 +37,7 @@ public async Task Get()
     public async Task GetById()
     {
       var all = await localHueClient.GetLightsAsync();
-      var id = all.Data.First().Id;
+      var id = all.Data.Last().Id;
 
       var result = await localHueClient.GetLightAsync(id);
 
@@ -56,13 +57,24 @@ public async Task PutById()
 
       UpdateLight req = new UpdateLight()
       {
-        Alert = new UpdateAlert()
+        Signaling = new SignalingUpdate
+        {
+          Signal = Signal.alternating,
+          Duration = 60000,
+          Colors = new List<Color>
+          {
+            new Color { Xy = new XyPosition { X = 0.456, Y = 0.123, }},
+            new Color { Xy = new XyPosition { X = 0.333, Y = 0.712, }}
+          }
+        }
       };
       var result = await localHueClient.UpdateLightAsync(id, req);
 
       Assert.IsNotNull(result);
       Assert.IsFalse(result.HasErrors);
 
+      var resultRead = await localHueClient.GetLightAsync(id);
+
       Assert.IsTrue(result.Data.Count == 1);
       Assert.AreEqual(id, result.Data.First().Rid);
 
diff --git a/src/HueApi/HueApi.csproj b/src/HueApi/HueApi.csproj
index 7565ff2..6b199d8 100644
--- a/src/HueApi/HueApi.csproj
+++ b/src/HueApi/HueApi.csproj
@@ -6,7 +6,7 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <WarningsAsErrors>nullable</WarningsAsErrors>
-    <Version>1.5.0</Version>
+    <Version>1.5.1</Version>
     <Authors>Michiel Post</Authors>
     <Description>For Clip v2 API. Open source library for interaction with the Philips Hue Bridge. Allows you to control your lights from C#.</Description>
     <PackageProjectUrl>https://github.com/michielpost/Q42.HueApi</PackageProjectUrl>
diff --git a/src/HueApi/Models/Device.cs b/src/HueApi/Models/Device.cs
index bd17485..831f665 100644
--- a/src/HueApi/Models/Device.cs
+++ b/src/HueApi/Models/Device.cs
@@ -11,25 +11,28 @@ namespace HueApi.Models
   public class ProductData
   {
     [JsonPropertyName("certified")]
-    public bool Certified { get; set; }
+    public bool? Certified { get; set; }
 
     [JsonPropertyName("manufacturer_name")]
-    public string ManufacturerName { get; set; } = default!;
+    public string? ManufacturerName { get; set; }
 
     [JsonPropertyName("model_id")]
-    public string ModelId { get; set; } = default!;
+    public string? ModelId { get; set; }
 
     [JsonPropertyName("product_archetype")]
-    public string ProductArchetype { get; set; } = default!;
+    public string? ProductArchetype { get; set; }
 
     [JsonPropertyName("product_name")]
-    public string ProductName { get; set; } = default!;
+    public string? ProductName { get; set; } 
 
     [JsonPropertyName("software_version")]
-    public string SoftwareVersion { get; set; } = default!;
+    public string? SoftwareVersion { get; set; }
 
     [JsonPropertyName("hardware_platform_type")]
-    public string HardwarePlatformType { get; set; } = default!;
+    public string? HardwarePlatformType { get; set; }
+
+    [JsonPropertyName("function")]
+    public string? Function { get; set; }
   }
 
   public class Device : HueResource
diff --git a/src/HueApi/Models/GroupedLight.cs b/src/HueApi/Models/GroupedLight.cs
index e86db0f..98f89a3 100644
--- a/src/HueApi/Models/GroupedLight.cs
+++ b/src/HueApi/Models/GroupedLight.cs
@@ -9,10 +9,16 @@ namespace HueApi.Models
 {
   public class GroupedLight : HueResource
   {
+    [JsonPropertyName("on")]
+    public On On { get; set; } = default!;
+
+    [JsonPropertyName("dimming")]
+    public Dimming? Dimming { get; set; }
+
     [JsonPropertyName("alert")]
     public Alert? Alert { get; set; }
 
-    [JsonPropertyName("on")]
-    public On? On { get; set; }
+    [JsonPropertyName("signaling")]
+    public Signaling? Signaling { get; set; }
   }
 }
diff --git a/src/HueApi/Models/Light.cs b/src/HueApi/Models/Light.cs
index 184fc93..a8855ba 100644
--- a/src/HueApi/Models/Light.cs
+++ b/src/HueApi/Models/Light.cs
@@ -33,6 +33,9 @@ public class Light : HueResource
     [JsonPropertyName("alert")]
     public Alert? Alert { get; set; }
 
+    [JsonPropertyName("product_data")]
+    public ProductData? ProductData { get; set; }
+
     [JsonPropertyName("signaling")]
     public Signaling? Signaling { get; set; }
 
@@ -61,6 +64,9 @@ public class Alert
 
   public class Signaling
   {
+    [JsonPropertyName("signal_values")]
+    public List<Signal>? SignalValues { get; set; }
+
     [JsonPropertyName("status")]
     public SignalingStatus? Status { get; set; }
   }
@@ -78,6 +84,25 @@ public class SignalingStatus
     /// </summary>
     [JsonPropertyName("estimated_end")]
     public DateTimeOffset? EstimatedEnd { get; set; }
+
+    [JsonPropertyName("colors")]
+    public List<XyPosition>? Colors { get; set; }
+  }
+
+  public class SignalingUpdate
+  {
+    [JsonPropertyName("signal")]
+    public Signal Signal { get; set; }
+
+    [JsonPropertyName("duration")]
+    public int Duration { get; set; }
+
+    /// <summary>
+    /// List of colors to apply to the signal (not supported by all signals)
+    /// </summary>
+    [JsonPropertyName("colors")]
+    public List<Color>? Colors { get; set; }
+
   }
 
   public class Dynamics
@@ -297,6 +322,6 @@ public enum PowerUpOnMode
   [JsonConverter(typeof(JsonStringEnumConverter))]
   public enum Signal
   {
-    no_signal, on_off
+    no_signal, on_off, on_off_color, alternating
   }
 }
diff --git a/src/HueApi/Models/Requests/UpdateGroupedLight.cs b/src/HueApi/Models/Requests/UpdateGroupedLight.cs
index c07727c..16db5d7 100644
--- a/src/HueApi/Models/Requests/UpdateGroupedLight.cs
+++ b/src/HueApi/Models/Requests/UpdateGroupedLight.cs
@@ -31,6 +31,9 @@ public class UpdateGroupedLight : BaseResourceRequest, IUpdateColor, IUpdateColo
     [JsonPropertyName("alert")]
     public UpdateAlert? Alert { get; set; }
 
+    [JsonPropertyName("signaling")]
+    public SignalingUpdate? Signaling { get; set; }
+
     [JsonPropertyName("dynamics")]
     public Dynamics? Dynamics { get; set; }
 
diff --git a/src/HueApi/Models/Requests/UpdateLight.cs b/src/HueApi/Models/Requests/UpdateLight.cs
index a88c321..943203d 100644
--- a/src/HueApi/Models/Requests/UpdateLight.cs
+++ b/src/HueApi/Models/Requests/UpdateLight.cs
@@ -34,6 +34,9 @@ public class UpdateLight : BaseResourceRequest, IUpdateColor, IUpdateColorTemper
     [JsonPropertyName("alert")]
     public UpdateAlert? Alert { get; set; }
 
+    [JsonPropertyName("signaling")]
+    public SignalingUpdate? Signaling { get; set; }
+
     [JsonPropertyName("gradient")]
     public Gradient? Gradient { get; set; }