diff --git a/src/map.cpp b/src/map.cpp
diff --git a/src/map.h b/src/map.h
@@ -208,22 +208,6 @@ class Map /*: public NodeContainer*/
 	// position is valid, otherwise false
 	MapNode getNodeNoEx(v3s16 p, bool *is_valid_position = NULL);
 
-	void unspreadLight(enum LightBank bank,
-			std::map<v3s16, u8> & from_nodes,
-			std::set<v3s16> & light_sources,
-			std::map<v3s16, MapBlock*> & modified_blocks);
-
-	void spreadLight(enum LightBank bank,
-			std::set<v3s16> & from_nodes,
-			std::map<v3s16, MapBlock*> & modified_blocks);
-
-	void updateLighting(enum LightBank bank,
-			std::map<v3s16, MapBlock*>  & a_blocks,
-			std::map<v3s16, MapBlock*> & modified_blocks);
-
-	void updateLighting(std::map<v3s16, MapBlock*>  & a_blocks,
-			std::map<v3s16, MapBlock*> & modified_blocks);
-
 	/*
 		These handle lighting but not faces.
 	*/

diff --git a/src/mg_schematic.cpp b/src/mg_schematic.cpp
@@ -30,6 +30,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "util/serialize.h"
 #include "serialization.h"
 #include "filesys.h"
+#include "voxelalgorithms.h"
 
 ///////////////////////////////////////////////////////////////////////////////
 
@@ -202,7 +203,7 @@ bool Schematic::placeOnVManip(MMVManip *vm, v3s16 p, u32 flags,
 	return vm->m_area.contains(VoxelArea(p, p + s - v3s16(1,1,1)));
 }
 
-void Schematic::placeOnMap(Map *map, v3s16 p, u32 flags,
+void Schematic::placeOnMap(ServerMap *map, v3s16 p, u32 flags,
 	Rotation rot, bool force_place)
 {
 	std::map<v3s16, MapBlock *> lighting_modified_blocks;
@@ -238,15 +239,10 @@ void Schematic::placeOnMap(Map *map, v3s16 p, u32 flags,
 
 	blitToVManip(&vm, p, rot, force_place);
 
-	vm.blitBackAll(&modified_blocks);
+	voxalgo::blit_back_with_light(map, &vm, &modified_blocks);
 
 	//// Carry out post-map-modification actions
 
-	//// Update lighting
-	// TODO: Optimize this by using Mapgen::calcLighting() instead
-	lighting_modified_blocks.insert(modified_blocks.begin(), modified_blocks.end());
-	map->updateLighting(lighting_modified_blocks, modified_blocks);
-
 	//// Create & dispatch map modification events to observers
 	MapEditEvent event;
 	event.type = MEET_OTHER;

diff --git a/src/mg_schematic.h b/src/mg_schematic.h
@@ -25,6 +25,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "util/string.h"
 
 class Map;
+class ServerMap;
 class Mapgen;
 class MMVManip;
 class PseudoRandom;
@@ -108,7 +109,7 @@ class Schematic : public ObjDef, public NodeResolver {
 
 	void blitToVManip(MMVManip *vm, v3s16 p, Rotation rot, bool force_place);
 	bool placeOnVManip(MMVManip *vm, v3s16 p, u32 flags, Rotation rot, bool force_place);
-	void placeOnMap(Map *map, v3s16 p, u32 flags, Rotation rot, bool force_place);
+	void placeOnMap(ServerMap *map, v3s16 p, u32 flags, Rotation rot, bool force_place);
 
 	void applyProbabilities(v3s16 p0,
 		std::vector<std::pair<v3s16, u8> > *plist,

diff --git a/src/script/lua_api/l_mapgen.cpp b/src/script/lua_api/l_mapgen.cpp
@@ -1357,7 +1357,9 @@ int ModApiMapgen::l_place_schematic(lua_State *L)
 {
 	MAP_LOCK_REQUIRED;
 
-	Map *map = &(getEnv(L)->getMap());
+	GET_ENV_PTR;
+
+	ServerMap *map = &(env->getServerMap());
 	SchematicManager *schemmgr = getServer(L)->getEmergeManager()->schemmgr;
 
 	//// Read position

diff --git a/src/script/lua_api/l_vmanip.cpp b/src/script/lua_api/l_vmanip.cpp
@@ -27,6 +27,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "map.h"
 #include "server.h"
 #include "mapgen.h"
+#include "voxelalgorithms.h"
 
 // garbage collector
 int LuaVoxelManip::gc_object(lua_State *L)
@@ -109,10 +110,24 @@ int LuaVoxelManip::l_write_to_map(lua_State *L)
 	MAP_LOCK_REQUIRED;
 
 	LuaVoxelManip *o = checkobject(L, 1);
-	MMVManip *vm = o->vm;
+	GET_ENV_PTR;
+	ServerMap *map = &(env->getServerMap());
+	if (o->is_mapgen_vm) {
+		o->vm->blitBackAll(&(o->modified_blocks));
+	} else {
+		voxalgo::blit_back_with_light(map, o->vm,
+			&(o->modified_blocks));
+	}
 
-	vm->blitBackAll(&o->modified_blocks);
+	MapEditEvent event;
+	event.type = MEET_OTHER;
+	for (std::map<v3s16, MapBlock *>::iterator it = o->modified_blocks.begin();
+			it != o->modified_blocks.end(); ++it)
+		event.modified_blocks.insert(it->first);
 
+	map->dispatchEvent(&event);
+
+	o->modified_blocks.clear();
 	return 0;
 }
 
@@ -322,33 +337,6 @@ int LuaVoxelManip::l_set_param2_data(lua_State *L)
 
 int LuaVoxelManip::l_update_map(lua_State *L)
 {
-	GET_ENV_PTR;
-
-	LuaVoxelManip *o = checkobject(L, 1);
-	if (o->is_mapgen_vm)
-		return 0;
-
-	Map *map = &(env->getMap());
-
-	// TODO: Optimize this by using Mapgen::calcLighting() instead
-	std::map<v3s16, MapBlock *> lighting_mblocks;
-	std::map<v3s16, MapBlock *> *mblocks = &o->modified_blocks;
-
-	lighting_mblocks.insert(mblocks->begin(), mblocks->end());
-
-	map->updateLighting(lighting_mblocks, *mblocks);
-
-	MapEditEvent event;
-	event.type = MEET_OTHER;
-	for (std::map<v3s16, MapBlock *>::iterator
-		it = mblocks->begin();
-		it != mblocks->end(); ++it)
-		event.modified_blocks.insert(it->first);
-
-	map->dispatchEvent(&event);
-
-	mblocks->clear();
-
 	return 0;
 }
 

diff --git a/src/treegen.cpp b/src/treegen.cpp
@@ -25,6 +25,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "serverenvironment.h"
 #include "nodedef.h"
 #include "treegen.h"
+#include "voxelalgorithms.h"
 
 namespace treegen
 {
@@ -125,12 +126,8 @@ treegen::error spawn_ltree(ServerEnvironment *env, v3s16 p0,
 	if (e != SUCCESS)
 		return e;
 
-	vmanip.blitBackAll(&modified_blocks);
+	voxalgo::blit_back_with_light(map, &vmanip, &modified_blocks);
 
-	// update lighting
-	std::map<v3s16, MapBlock*> lighting_modified_blocks;
-	lighting_modified_blocks.insert(modified_blocks.begin(), modified_blocks.end());
-	map->updateLighting(lighting_modified_blocks, modified_blocks);
 	// Send a MEET_OTHER event
 	MapEditEvent event;
 	event.type = MEET_OTHER;

diff --git a/src/voxelalgorithms.cpp b/src/voxelalgorithms.cpp
diff --git a/src/voxelalgorithms.h b/src/voxelalgorithms.h
@@ -26,7 +26,9 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "util/cpp11_container.h"
 
 class Map;
+class ServerMap;
 class MapBlock;
+class MMVManip;
 
 namespace voxalgo
 {
@@ -84,6 +86,17 @@ void update_lighting_nodes(
 void update_block_border_lighting(Map *map, MapBlock *block,
 	std::map<v3s16, MapBlock*> &modified_blocks);
 
+/*!
+ * Copies back nodes from a voxel manipulator
+ * to the map and updates lighting.
+ * For server use only.
+ *
+ * \param modified_blocks output, contains all map blocks that
+ * the function modified
+ */
+void blit_back_with_light(ServerMap *map, MMVManip *vm,
+	std::map<v3s16, MapBlock*> *modified_blocks);
+
 /*!
  * This class iterates trough voxels that intersect with
  * a line. The collision detection does not see nodeboxes,