diff --git a/proto_1.12.2/src/main/java/mc/core/network/proto_1_12_2/packets/ChunkDataPacket.java b/proto_1.12.2/src/main/java/mc/core/network/proto_1_12_2/packets/ChunkDataPacket.java
index c90651e..86ea7d7 100644
--- a/proto_1.12.2/src/main/java/mc/core/network/proto_1_12_2/packets/ChunkDataPacket.java
+++ b/proto_1.12.2/src/main/java/mc/core/network/proto_1_12_2/packets/ChunkDataPacket.java
@@ -8,7 +8,10 @@ import lombok.extern.slf4j.Slf4j;
 import mc.core.network.NetOutputStream;
 import mc.core.network.SCPacket;
 import mc.core.network.proto_1_12_2.ByteArrayOutputNetStream;
+import mc.core.utils.NibbleArray;
+import mc.core.world.Biome;
 import mc.core.world.block.Block;
+import mc.core.world.block.BlockLocation;
 import mc.core.world.block.BlockType;
 import mc.core.world.chunk.Chunk;
 import mc.core.world.chunk.ChunkSection;
@@ -151,7 +154,7 @@ public class ChunkDataPacket implements SCPacket {
                 for (int z = 0; z < 16; z++) {
                     for (int x = 15; x >= 0; x--) {
                         palettedChunkSection.addBlock(chunkSection.getBlockLocal(x, y, z));
-                        palettedChunkSection.addSkyLight(chunkSection.getSkyLightLocal(x, y, z));
+                        palettedChunkSection.addSkyLight(15-x, y, z, chunkSection.getSkyLightLocal(15-x, y, z));
 
                         if (biomeWrite) {
                             biomes.writeByte(chunkSection.getBiomeLocal(x, z).getId());
@@ -182,15 +185,13 @@ public class ChunkDataPacket implements SCPacket {
         private int dataItems = 0;
         private ByteArrayOutputNetStream dataArray = new ByteArrayOutputNetStream();
         private ByteArrayOutputNetStream blockLight = new ByteArrayOutputNetStream();
-        private ByteArrayOutputNetStream skyLight = new ByteArrayOutputNetStream();
+        private NibbleArray skyLight = new NibbleArray();
 
         private int idxHalfLong = 0;
         private int idxHalfByte1 = 0;
-        private int idxHalfByte2 = 0;
 
         private long dataValueCompacted = 0;
         private int blockLightCompacted = 0;
-        private int skyLightCompacted = 0;
 
         private int serializeBlockState(BlockType blockType) {
             return (blockType.getId() << 4) | blockType.getMeta();
@@ -239,16 +240,9 @@ public class ChunkDataPacket implements SCPacket {
             }
         }
 
-        void addSkyLight(int value) {
+        void addSkyLight(int x, int y, int z, int value) {
             // sky light data
-            if (idxHalfByte2 == 0) {
-                skyLightCompacted = value;
-                idxHalfByte2++;
-            } else {
-                skyLightCompacted = (skyLightCompacted << 4) | value;
-                skyLight.writeByte(skyLightCompacted);
-                idxHalfByte2 = 0;
-            }
+            skyLight.set(x, y, z, value);
         }
 
         void writeToNetStream(final NetOutputStream netOutputStream) {
@@ -265,7 +259,7 @@ public class ChunkDataPacket implements SCPacket {
             netOutputStream.writeBytes(blockLight.toByteArray());
             //     </Block Light>
             //     <Sky Light>
-            netOutputStream.writeBytes(skyLight.toByteArray());
+            netOutputStream.writeBytes(skyLight.getRawData());
             //     </Sky Light>
         }
     }