--- a/net/minecraft/client/renderer/LightTexture.java
+++ b/net/minecraft/client/renderer/LightTexture.java
@@ -169,7 +169,7 @@
    }
 
    public static int func_228450_a_(int p_228450_0_) {
-      return p_228450_0_ >> 4 & '\uffff';
+      return (p_228450_0_ & 0xFFFF) >> 4; // Forge: Fix fullbright quads showing dark artifacts. Reported as MC-169806
    }
 
    public static int func_228454_b_(int p_228454_0_) {
