diff --git a/resources/web/wwi/Parser.js b/resources/web/wwi/Parser.js
index c54213955ff..bea4d58cdb1 100644
--- a/resources/web/wwi/Parser.js
+++ b/resources/web/wwi/Parser.js
@@ -674,9 +674,18 @@ export default class Parser {
       newNode = new WbGyro(id, translation, scale, rotation, name === '' ? 'gyro' : name);
     else if (node.tagName === 'InertialUnit')
       newNode = new WbInertialUnit(id, translation, scale, rotation, name === '' ? 'inertial unit' : name);
-    else if (node.tagName === 'LED')
-      newNode = new WbLed(id, translation, scale, rotation, name === '' ? 'led' : name);
-    else if (node.tagName === 'Lidar') {
+    else if (node.tagName === 'LED') {
+      let tempColor = getNodeAttribute(node, 'color', '1 0 0');
+      tempColor = convertStringToFloatArray(tempColor);
+      const color = [];
+      if (tempColor.length % 3 === 0) {
+        for (let i = 0; i < tempColor.length; i += 3)
+          color.push(new WbVector3(tempColor[i], tempColor[i + 1], tempColor[i + 2]));
+      } else
+        console.error('Wrong number of colors in LED');
+
+      newNode = new WbLed(id, translation, scale, rotation, name === '' ? 'led' : name, color);
+    } else if (node.tagName === 'Lidar') {
       const fieldOfView = parseFloat(getNodeAttribute(node, 'fieldOfView', Math.PI / 2));
       const horizontalResolution = parseInt(getNodeAttribute(node, 'horizontalResolution', '512'));
       const maxRange = parseFloat(getNodeAttribute(node, 'maxRange', '1'));
diff --git a/resources/web/wwi/nodes/WbAppearance.js b/resources/web/wwi/nodes/WbAppearance.js
index 2eabaf499ca..106bf10dc2b 100644
--- a/resources/web/wwi/nodes/WbAppearance.js
+++ b/resources/web/wwi/nodes/WbAppearance.js
@@ -24,6 +24,9 @@ export default class WbAppearance extends WbAbstractAppearance {
       this.#material.onChange = () => this.#update();
 
     this.#update();
+
+    if (typeof this.notifyLed !== 'undefined')
+      this.notifyLed();
   }
 
   get texture() {
diff --git a/resources/web/wwi/nodes/WbLed.js b/resources/web/wwi/nodes/WbLed.js
index c8edb745577..c792363c02d 100644
--- a/resources/web/wwi/nodes/WbLed.js
+++ b/resources/web/wwi/nodes/WbLed.js
@@ -1,5 +1,160 @@
+import WbAppearance from './WbAppearance.js';
 import WbDevice from './WbDevice.js';
+import WbGroup from './WbGroup.js';
+import WbLight from './WbLight.js';
+import WbShape from './WbShape.js';
+import WbVector3 from './utils/WbVector3.js';
+import {clampValuesIfNeeded} from './utils/WbFieldChecker.js';
 
 // This class is used to retrieve the type of device
 export default class WbLed extends WbDevice {
+  #color;
+  #lights;
+  #materials;
+  #pbrAppearances;
+  #value;
+  constructor(id, translation, scale, rotation, name, color) {
+    super(id, translation, scale, rotation, name);
+    this.#lights = [];
+    this.#materials = [];
+    this.#pbrAppearances = [];
+    this.#color = color;
+    this.#value = 0;
+  }
+
+  get value() {
+    return this.#value;
+  }
+
+  set value(newValue) {
+    if (this.#value === newValue)
+      return;
+    this.#value = newValue;
+
+    this.#setMaterialsAndLightsColor();
+  }
+
+  postFinalize() {
+    super.postFinalize();
+
+    this._updateChildren();
+
+    // disable WREN lights if not on
+    const on = this.#value !== 0;
+    for (const light of this.#lights)
+      light.on = on;
+  }
+
+  applyOptionalRendering(enable) {
+    this.value = enable ? 1 : 0;
+  }
+
+  _updateChildren() {
+    if (!this.isPostFinalizedCalled)
+      return;
+
+    this.#findMaterialsAndLights(this);
+
+    // update color of lights and materials
+    this.#setMaterialsAndLightsColor();
+  }
+
+  #clearMaterialsAndLights() {
+    this.#materials = [];
+    this.#lights = [];
+    this.#pbrAppearances = [];
+  }
+
+  #findMaterialsAndLights(group) {
+    let size = group.children.length;
+    if (size < 1)
+      return;
+
+    if (group === this) {
+      this.#clearMaterialsAndLights();
+      size = 1; // we look only into the first child of the WbLed node
+    }
+
+    for (const child of group.children) {
+      if (child instanceof WbShape && typeof child.appearance !== 'undefined') {
+        const appearance = child.appearance;
+        if (appearance instanceof WbAppearance) {
+          const material = appearance.material;
+          if (typeof material !== 'undefined')
+            this.#materials.push(material);
+
+          appearance.notifyLed = () => this._updateChildren();
+          child.notifyLed = () => this._updateChildren();
+        } else if (typeof appearance !== 'undefined') {
+          this.#pbrAppearances.push(appearance);
+          child.notifyLed = () => this._updateChildren();
+        }
+      } else if (child instanceof WbLight)
+        this.#lights.push(child);
+      else if (child instanceof WbGroup) {
+        this.#findMaterialsAndLights(child);
+        const proxy = new Proxy(child.children, {
+          deleteProperty: (target, property) => {
+            delete target[property];
+            this._updateChildren();
+            return true;
+          },
+          set: (target, property, value, receiver) => {
+            target[property] = value;
+            this._updateChildren();
+            return true;
+          }
+        });
+        child.children = proxy;
+      }
+    }
+
+    if (group === this && !this.#isAnyMaterialOrLightFound())
+      console.warn(`No PBRAppearance, Material and no Light found.
+          The first child of a LED should be either a Shape, a Light or a Group containing Shape and Light nodes.`);
+  }
+
+  #isAnyMaterialOrLightFound() {
+    return (this.#materials.length > 0 || this.#lights.length > 0 || this.#pbrAppearances.length > 0);
+  }
+
+  #setMaterialsAndLightsColor() {
+    // compute the new color
+    let r, g, b;
+    if (this.#value > 0) {
+      if (this.#value - 1 < this.#color.length) {
+        const c = this.#color[this.value - 1];
+        r = c.x;
+        g = c.y;
+        b = c.z;
+      } else {
+        r = 1;
+        g = 1;
+        b = 1;
+      }
+    } else {
+      r = 0;
+      g = 0;
+      b = 0;
+    }
+
+    let color = new WbVector3(r, g, b);
+    color = clampValuesIfNeeded(color);
+
+    // update every material
+    for (const material of this.#materials)
+      material.emissiveColor = color;
+
+    // same for PbrAppearances
+    for (const pbrAppearance of this.#pbrAppearances)
+      pbrAppearance.emissiveColor = color;
+
+    // update every lights
+    const on = this.#value !== 0;
+    for (const light of this.#lights) {
+      light.color = color;
+      // disable WREN lights if not on
+      light.on = on;
+    }
+  }
 }
diff --git a/resources/web/wwi/nodes/WbShape.js b/resources/web/wwi/nodes/WbShape.js
index fb6ad162f0e..d7edd3fc0fd 100644
--- a/resources/web/wwi/nodes/WbShape.js
+++ b/resources/web/wwi/nodes/WbShape.js
@@ -42,6 +42,9 @@ export default class WbShape extends WbBaseNode {
         useNode.appearance.parent = useNode.id;
       }
     }
+
+    if (typeof this.notifyLed !== 'undefined')
+      this.notifyLed();
   }
 
   applyMaterialToGeometry() {
diff --git a/resources/web/wwi/nodes/utils/WbFieldChecker.js b/resources/web/wwi/nodes/utils/WbFieldChecker.js
index e7b20cccfb3..11f9ab72f72 100644
--- a/resources/web/wwi/nodes/utils/WbFieldChecker.js
+++ b/resources/web/wwi/nodes/utils/WbFieldChecker.js
@@ -86,5 +86,5 @@ function clampValue(value) {
   return value;
 }
 
-export {resetIfNegative, resetIfNonPositive, resetVector2IfNonPositive, resetVector3IfNonPositive,
+export {resetIfNegative, resetIfNonPositive, resetVector2IfNonPositive, resetVector3IfNonPositive, clampValuesIfNeeded,
   resetIfNotInRangeWithIncludedBounds, resetColorIfInvalid, resetMultipleColorIfInvalid, resetVector3IfNegative};
diff --git a/resources/web/wwi/protoVisualizer/Node.js b/resources/web/wwi/protoVisualizer/Node.js
index 8687828a421..bd5ce90f759 100644
--- a/resources/web/wwi/protoVisualizer/Node.js
+++ b/resources/web/wwi/protoVisualizer/Node.js
@@ -288,7 +288,7 @@ export default class Node {
         if (line.indexOf('EXTERNPROTO') !== -1) { // get only the text after 'EXTERNPROTO'
           let address = line.split('EXTERNPROTO')[1].trim().replaceAll('"', '');
           if (address.startsWith('webots://'))
-            address = 'https://raw.githubusercontent.com/cyberbotics/webots/released/' + address.substring(9);
+            address = 'https://raw.githubusercontent.com/cyberbotics/webots/develop/' + address.substring(9); // TODO change to released once a new version is published
           else
             address = combinePaths(address, protoUrl);
 
diff --git a/resources/web/wwi/protoVisualizer/Vrml.js b/resources/web/wwi/protoVisualizer/Vrml.js
index 450e4d01f8c..07524da5b4c 100644
--- a/resources/web/wwi/protoVisualizer/Vrml.js
+++ b/resources/web/wwi/protoVisualizer/Vrml.js
@@ -728,6 +728,9 @@ export class MFVec3f extends MultipleValue {
 
 export class MFColor extends MultipleValue {
   setValueFromTokenizer(tokenizer) {
+    // If we reach this function it means that the MFColor does not have the default value.
+    // Thus we should reset the value because it already contains the default one: [1 0 0].
+    this.value = [];
     if (tokenizer.peekWord() === '[') {
       tokenizer.skipToken('[');