PaperMC/nms-patches/BlockRedstoneLamp.patch

--- a/net/minecraft/server/BlockRedstoneLamp.java
+++ b/net/minecraft/server/BlockRedstoneLamp.java
@@ -3,6 +3,8 @@
 import java.util.Random;
 import javax.annotation.Nullable;
 
+import org.bukkit.craftbukkit.event.CraftEventFactory; // CraftBukkit
+
 public class BlockRedstoneLamp extends Block {
 
     public static final BlockStateBoolean a = BlockRedstoneTorch.LIT;
@@ -27,6 +29,11 @@
                 if (flag1) {
                     world.getBlockTickList().a(blockposition, this, 4);
                 } else {
+                    // CraftBukkit start
+                    if (CraftEventFactory.callRedstoneChange(world, blockposition, 0, 15).getNewCurrent() != 15) {
+                        return;
+                    }
+                    // CraftBukkit end
                     world.setTypeAndData(blockposition, (IBlockData) iblockdata.a((IBlockState) BlockRedstoneLamp.a), 2);
                 }
             }
@@ -37,6 +44,11 @@
     @Override
     public void tickAlways(IBlockData iblockdata, WorldServer worldserver, BlockPosition blockposition, Random random) {
         if ((Boolean) iblockdata.get(BlockRedstoneLamp.a) && !worldserver.isBlockIndirectlyPowered(blockposition)) {
+            // CraftBukkit start
+            if (CraftEventFactory.callRedstoneChange(worldserver, blockposition, 15, 0).getNewCurrent() != 0) {
+                return;
+            }
+            // CraftBukkit end
             worldserver.setTypeAndData(blockposition, (IBlockData) iblockdata.a((IBlockState) BlockRedstoneLamp.a), 2);
         }