diff --git a/prismarine-viewer/viewer/lib/viewer.ts b/prismarine-viewer/viewer/lib/viewer.ts
index 1b11ac63d..9cb7eb3db 100644
--- a/prismarine-viewer/viewer/lib/viewer.ts
+++ b/prismarine-viewer/viewer/lib/viewer.ts
@@ -77,8 +77,8 @@ export class Viewer {
     // this.primitives.clear()
   }
 
-  addColumn (x, z, chunk) {
-    this.world.addColumn(x, z, chunk)
+  addColumn (x, z, chunk, isLightUpdate = false) {
+    this.world.addColumn(x, z, chunk, isLightUpdate)
   }
 
   removeColumn (x: string, z: string) {
@@ -148,9 +148,9 @@ export class Viewer {
       // this.updatePrimitive(p)
     })
 
-    emitter.on('loadChunk', ({ x, z, chunk, worldConfig }) => {
+    emitter.on('loadChunk', ({ x, z, chunk, worldConfig, isLightUpdate }) => {
       this.world.worldConfig = worldConfig
-      this.addColumn(x, z, chunk)
+      this.addColumn(x, z, chunk, isLightUpdate)
     })
     // todo remove and use other architecture instead so data flow is clear
     emitter.on('blockEntities', (blockEntities) => {
diff --git a/prismarine-viewer/viewer/lib/worldDataEmitter.ts b/prismarine-viewer/viewer/lib/worldDataEmitter.ts
index fa916c514..6743e3372 100644
--- a/prismarine-viewer/viewer/lib/worldDataEmitter.ts
+++ b/prismarine-viewer/viewer/lib/worldDataEmitter.ts
@@ -75,7 +75,7 @@ export class WorldDataEmitter extends EventEmitter {
 
     bot._client.on('update_light', ({ chunkX, chunkZ }) => {
       const chunkPos = new Vec3(chunkX * 16, 0, chunkZ * 16)
-      this.loadChunk(chunkPos)
+      this.loadChunk(chunkPos, true)
     })
 
     this.emitter.on('listening', () => {
@@ -128,7 +128,7 @@ export class WorldDataEmitter extends EventEmitter {
     }
   }
 
-  async loadChunk (pos: ChunkPos) {
+  async loadChunk (pos: ChunkPos, isLightUpdate = false) {
     const [botX, botZ] = chunkPos(this.lastPos)
     const dx = Math.abs(botX - Math.floor(pos.x / 16))
     const dz = Math.abs(botZ - Math.floor(pos.z / 16))
@@ -143,7 +143,7 @@ export class WorldDataEmitter extends EventEmitter {
           worldHeight: column['worldHeight'] ?? 256,
         }
         //@ts-ignore
-        this.emitter.emit('loadChunk', { x: pos.x, z: pos.z, chunk, blockEntities: column.blockEntities, worldConfig })
+        this.emitter.emit('loadChunk', { x: pos.x, z: pos.z, chunk, blockEntities: column.blockEntities, worldConfig, isLightUpdate })
         this.loadedChunks[`${pos.x},${pos.z}`] = true
       }
     } else {
diff --git a/prismarine-viewer/viewer/lib/worldrendererCommon.ts b/prismarine-viewer/viewer/lib/worldrendererCommon.ts
index ae2a91d3b..439839773 100644
--- a/prismarine-viewer/viewer/lib/worldrendererCommon.ts
+++ b/prismarine-viewer/viewer/lib/worldrendererCommon.ts
@@ -211,7 +211,7 @@ export abstract class WorldRendererCommon<WorkerSend = any, WorkerReceive = any>
 
   }
 
-  addColumn (x, z, chunk) {
+  addColumn (x: number, z: number, chunk: any, isLightUpdate: boolean) {
     if (this.workers.length === 0) throw new Error('workers not initialized yet')
     this.initialChunksLoad = false
     this.loadedChunks[`${x},${z}`] = true
@@ -222,10 +222,12 @@ export abstract class WorldRendererCommon<WorkerSend = any, WorkerReceive = any>
     for (let y = this.worldConfig.minY; y < this.worldConfig.worldHeight; y += 16) {
       const loc = new Vec3(x, y, z)
       this.setSectionDirty(loc)
-      this.setSectionDirty(loc.offset(-16, 0, 0))
-      this.setSectionDirty(loc.offset(16, 0, 0))
-      this.setSectionDirty(loc.offset(0, 0, -16))
-      this.setSectionDirty(loc.offset(0, 0, 16))
+      if (!isLightUpdate || this.mesherConfig.smoothLighting) {
+        this.setSectionDirty(loc.offset(-16, 0, 0))
+        this.setSectionDirty(loc.offset(16, 0, 0))
+        this.setSectionDirty(loc.offset(0, 0, -16))
+        this.setSectionDirty(loc.offset(0, 0, 16))
+      }
     }
   }
 
diff --git a/src/watchOptions.ts b/src/watchOptions.ts
index 1493e7d18..009463be2 100644
--- a/src/watchOptions.ts
+++ b/src/watchOptions.ts
@@ -44,7 +44,8 @@ export const watchOptionsAfterViewerInit = () => {
     viewer.entities.setVisible(o.renderEntities)
   })
 
-  viewer.world.mesherConfig.smoothLighting = options.smoothLighting
+  // viewer.world.mesherConfig.smoothLighting = options.smoothLighting
+  viewer.world.mesherConfig.smoothLighting = false // todo not supported for now
   subscribeKey(options, 'smoothLighting', () => {
     viewer.world.mesherConfig.smoothLighting = options.smoothLighting;
     (viewer.world as WorldRendererThree).rerenderAllChunks()