diff --git a/src/pocketmine/level/Level.php b/src/pocketmine/level/Level.php
index 6bee97008..8c025b4f8 100644
--- a/src/pocketmine/level/Level.php
+++ b/src/pocketmine/level/Level.php
@@ -1404,14 +1404,14 @@ class Level implements ChunkManager, Metadatable{
 		$this->timings->doBlockSkyLightUpdates->startTiming();
 
 		$oldHeightMap = $this->getHeightMap($x, $z);
-		$sourceId = $this->getBlockIdAt($x, $y, $z);
+		$source = $this->getBlockAt($x, $y, $z);
 
 		$yPlusOne = $y + 1;
 
 		if($yPlusOne === $oldHeightMap){ //Block changed directly beneath the heightmap. Check if a block was removed or changed to a different light-filter.
 			$newHeightMap = $this->getChunk($x >> 4, $z >> 4)->recalculateHeightMapColumn($x & 0x0f, $z & 0x0f);
 		}elseif($yPlusOne > $oldHeightMap){ //Block changed above the heightmap.
-			if(BlockFactory::$lightFilter[$sourceId] > 1 or BlockFactory::$diffusesSkyLight[$sourceId]){
+			if($source->getLightFilter() > 0 or $source->diffusesSkyLight()){
 				$this->setHeightMap($x, $z, $yPlusOne);
 				$newHeightMap = $yPlusOne;
 			}else{ //Block changed which has no effect on direct sky light, for example placing or removing glass.