diff --git a/code/__DEFINES/dcs/signals/signals_turf.dm b/code/__DEFINES/dcs/signals/signals_turf.dm
index f89f30d1eb4..321fb503cbf 100644
--- a/code/__DEFINES/dcs/signals/signals_turf.dm
+++ b/code/__DEFINES/dcs/signals/signals_turf.dm
@@ -40,3 +40,6 @@
 #define COMSIG_TURF_RESET_ELEVATION "turf_reset_elevation"
 	#define ELEVATION_CURRENT_PIXEL_SHIFT 1
 	#define ELEVATION_MAX_PIXEL_SHIFT 2
+
+///Called when turf no longer blocks light from passing through
+#define COMSIG_TURF_NO_LONGER_BLOCK_LIGHT "turf_no_longer_block_light"
diff --git a/code/modules/lighting/lighting_source.dm b/code/modules/lighting/lighting_source.dm
index 1a32686aa19..30c239160e5 100644
--- a/code/modules/lighting/lighting_source.dm
+++ b/code/modules/lighting/lighting_source.dm
@@ -95,6 +95,7 @@
 	LAZYADD(new_atom_host.light_sources, src)
 	if(ismovable(new_atom_host) && new_atom_host == source_atom)
 		RegisterSignal(new_atom_host, COMSIG_MOVABLE_MOVED, PROC_REF(update_host_lights))
+	RegisterSignal(new_atom_host, COMSIG_TURF_NO_LONGER_BLOCK_LIGHT, PROC_REF(force_update))
 	return TRUE
 
 ///remove this light source from old_atom_host's light_sources list, unsetting movement registrations
@@ -105,6 +106,7 @@
 	LAZYREMOVE(old_atom_host.light_sources, src)
 	if(ismovable(old_atom_host) && old_atom_host == source_atom)
 		UnregisterSignal(old_atom_host, COMSIG_MOVABLE_MOVED)
+	UnregisterSignal(old_atom_host, COMSIG_TURF_NO_LONGER_BLOCK_LIGHT)
 	return TRUE
 
 // Yes this doesn't align correctly on anything other than 4 width tabs.
diff --git a/code/modules/lighting/lighting_turf.dm b/code/modules/lighting/lighting_turf.dm
index 26ebbd1ba4e..949d9b59b8f 100644
--- a/code/modules/lighting/lighting_turf.dm
+++ b/code/modules/lighting/lighting_turf.dm
@@ -88,6 +88,9 @@
 			else //If fulltile and opaque, then the whole tile blocks view, no need to continue checking.
 				directional_opacity = ALL_CARDINALS
 				break
+	else
+		for(var/atom/movable/content as anything in contents)
+			SEND_SIGNAL(content, COMSIG_TURF_NO_LONGER_BLOCK_LIGHT)
 	if(. != directional_opacity && (. == ALL_CARDINALS || directional_opacity == ALL_CARDINALS))
 		reconsider_lights() //The lighting system only cares whether the tile is fully concealed from all directions or not.