Optimize a few things in overlay lighting procs

Credit to Rohesie

code/datums/components/overlay_lighting.dm

@@ -171,8 +171,7 @@
 
 ///Clears the affected_turfs lazylist, removing from its contents the effects of being near the light.
 /datum/component/overlay_lighting/proc/clean_old_turfs()
-	for(var/t in affected_turfs)
-		var/turf/lit_turf = t
+	for(var/turf/lit_turf as anything in affected_turfs)
 		lit_turf.dynamic_lumcount -= lum_power
 	affected_turfs = null
 
@@ -182,9 +181,12 @@
 	if(!current_holder)
 		return
 	var/atom/movable/light_source = GET_LIGHT_SOURCE
+	. = list()
 	for(var/turf/lit_turf in view(lumcount_range, get_turf(light_source)))
 		lit_turf.dynamic_lumcount += lum_power
-		LAZYADD(affected_turfs, lit_turf)
+		. += lit_turf
+	if(length(.))
+		affected_turfs = .
 
 
 ///Clears the old affected turfs and populates the new ones.
@@ -431,8 +433,7 @@
 	. = lum_power
 	lum_power = new_lum_power
 	var/difference = . - lum_power
-	for(var/t in affected_turfs)
-		var/turf/lit_turf = t
+	for(var/turf/lit_turf as anything in affected_turfs)
 		lit_turf.dynamic_lumcount -= difference
 
 ///Moves the light directional_atom that emits our "light" based on our position and our direction