Baselighting fixes/improvements (#16210)

code/datums/gamemodes/hvh.dm

@@ -30,7 +30,7 @@
 
 /datum/game_mode/hvh/post_setup()
 	. = ..()
-	for(var/z_num in SSmapping.areas_in_z)
+	for(var/z_num in SSmapping.levels_by_trait(ZTRAIT_MARINE_MAIN_SHIP))
 		set_z_lighting(z_num)
 
 //sets TGMC and SOM squads

code/game/turfs/turf.dm

@@ -314,8 +314,9 @@
 	if(W.directional_opacity != old_directional_opacity)
 		W.reconsider_lights()
 
-	if(thisarea.lighting_effect)
+	if(thisarea.area_has_base_lighting)
 		W.add_overlay(thisarea.lighting_effect)
+		W.luminosity = 1
 
 	if(!W.smoothing_behavior == NO_SMOOTHING)
 		return W

code/modules/lighting/lighting_area.dm

@@ -30,13 +30,8 @@
 	return ..()
 
 /area/proc/update_base_lighting()
-	if(!area_has_base_lighting && (!base_lighting_alpha || !base_lighting_color))
-		return
-
-	if(!area_has_base_lighting)
-		add_base_lighting()
-		return
-	remove_base_lighting()
+	if(area_has_base_lighting)
+		remove_base_lighting()
 	if(base_lighting_alpha && base_lighting_color)
 		add_base_lighting()
 

code/modules/mapping/map_template.dm

@@ -44,9 +44,8 @@
 				continue
 			if(istype(A, /obj/machinery/atmospherics))
 				atmos_machines += A
-	for(var/area/area AS in areas) //areas are init'd when the first turf is generated, some somethings in init are not done correctly
-		area.update_base_lighting()
-		area.reg_in_areas_in_z()
+
+	SSmapping.reg_in_areas_in_z(areas)
 	SSatoms.InitializeAtoms(atoms)
 	SSmachines.setup_template_powernets(cables)