diff --git a/worldedit-bukkit/src/main/java/com/boydti/fawe/bukkit/adapter/mc1_14/BlockMaterial_1_14.java b/worldedit-bukkit/src/main/java/com/boydti/fawe/bukkit/adapter/mc1_14/BlockMaterial_1_14.java
index e3fa05135..2299b9cd3 100644
--- a/worldedit-bukkit/src/main/java/com/boydti/fawe/bukkit/adapter/mc1_14/BlockMaterial_1_14.java
+++ b/worldedit-bukkit/src/main/java/com/boydti/fawe/bukkit/adapter/mc1_14/BlockMaterial_1_14.java
@@ -98,7 +98,7 @@ public class BlockMaterial_1_14 implements BlockMaterial {
 
     @Override
     public int getLightOpacity() {
-        return isTranslucent() ? 15 : 0;
+        return !isTranslucent() ? 15 : 0;
     }
 
     @Override
diff --git a/worldedit-bukkit/src/main/java/com/boydti/fawe/bukkit/adapter/mc1_15/BlockMaterial_1_15.java b/worldedit-bukkit/src/main/java/com/boydti/fawe/bukkit/adapter/mc1_15/BlockMaterial_1_15.java
index fa1461340..3a7c205ac 100644
--- a/worldedit-bukkit/src/main/java/com/boydti/fawe/bukkit/adapter/mc1_15/BlockMaterial_1_15.java
+++ b/worldedit-bukkit/src/main/java/com/boydti/fawe/bukkit/adapter/mc1_15/BlockMaterial_1_15.java
@@ -98,7 +98,7 @@ public class BlockMaterial_1_15 implements BlockMaterial {
 
     @Override
     public int getLightOpacity() {
-        return isTranslucent() ? 15 : 0;
+        return !isTranslucent() ? 15 : 0;
     }
 
     @Override
diff --git a/worldedit-bukkit/src/main/java/com/boydti/fawe/bukkit/adapter/mc1_15_2/BlockMaterial_1_15_2.java b/worldedit-bukkit/src/main/java/com/boydti/fawe/bukkit/adapter/mc1_15_2/BlockMaterial_1_15_2.java
index eb67c8f32..d510fa159 100644
--- a/worldedit-bukkit/src/main/java/com/boydti/fawe/bukkit/adapter/mc1_15_2/BlockMaterial_1_15_2.java
+++ b/worldedit-bukkit/src/main/java/com/boydti/fawe/bukkit/adapter/mc1_15_2/BlockMaterial_1_15_2.java
@@ -94,7 +94,7 @@ public class BlockMaterial_1_15_2 implements BlockMaterial {
 
     @Override
     public int getLightOpacity() {
-        return isTranslucent() ? 15 : 0;
+        return !isTranslucent() ? 15 : 0;
     }
 
     @Override