Fixes to lighting

-Fixed #2005 (for sure!)
-Fixed the stacking of brightness. Now the most bright item turned ON will be the one where the user gets its luminosity of.
-Cleaned the code a bit. Now only one var controls the on/off switch of light, and another holds the value of brightness when on.

code/controllers/_DynamicAreaLighting_TG.dm

@@ -294,6 +294,66 @@ area
 			//show the dark overlay so areas, not yet in a lighting subarea, won't be bright as day and look silly.
 				SetLightLevel(4)
 
+atom
+	var/light_on = 0 //Am I emitting light?
+	var/brightness_on = 0 //Luminosity when the above: light_on = 1
+
+	//Called when turning off or dropping a flashlight for ex.
+	//It checks the users slots for another source of light, and return the appropriate brightness. 0 if no other source is found
+	proc/search_light(mob/M, obj/item/W as obj)
+		var/list/slots
+		var/obj/item/I
+		var brightness = 0 //the new brightness to be returned
+
+		if (istype(M, /mob/living/carbon/human))
+			var/mob/living/carbon/human/H = M
+			slots = list (
+				"l_hand",
+				"r_hand",
+				"belt",
+				"head",
+				"l_pocket",
+				"r_pocket",
+				"s_store")
+
+			for (var/slot in slots)
+				switch(slot)
+					if("belt")
+						I = H.belt
+					if("head")
+						I = H.head
+					if("l_hand")
+						I = H.l_hand
+					if("r_hand")
+						I = H.r_hand
+					if("l_pocket")
+						I = H.l_store
+					if("r_pocket")
+						I = H.r_store
+					if("s_store")
+						I = H.s_store
+				if (I)
+					if ((I.light_on) && (I != W)) //an item emitting light other than itself
+						if (I.brightness_on > brightness)
+							brightness = I.brightness_on
+
+		else if (istype(M, /mob/living/carbon/monkey))
+			slots = list (
+				"l_hand",
+				"r_hand")
+
+			for (var/slot in slots)
+				switch(slot)
+					if("l_hand")
+						I = M.l_hand
+					if("r_hand")
+						I = M.r_hand
+				if (I)
+					if ((I.light_on) && (I != W)) //an item emitting light other than itself
+						if (I.brightness_on > brightness)
+							brightness = I.brightness_on
+
+		return brightness
 
 #undef LIGHTING_MAX_LUMINOSITY
 #undef LIGHTING_MAX_LUMINOSITY_MOB