diff --git a/mods/mesecons/mesecons_button/init.lua b/mods/mesecons/mesecons_button/init.lua
index ead688ee..f147d8f5 100644
--- a/mods/mesecons/mesecons_button/init.lua
+++ b/mods/mesecons/mesecons_button/init.lua
@@ -67,7 +67,7 @@ minetest.register_node("mesecons_button:button_on", {
 	paramtype2 = "facedir",
 	legacy_wallmounted = true,
 	walkable = false,
-	light_source = default.LIGHT_MAX-7,
+	light_source = LIGHT_MAX-7,
 	sunlight_propagates = true,
 	selection_box = {
 		type = "fixed",
diff --git a/mods/mesecons/mesecons_lamp/init.lua b/mods/mesecons/mesecons_lamp/init.lua
index e0df9ef5..6cdae2da 100644
--- a/mods/mesecons/mesecons_lamp/init.lua
+++ b/mods/mesecons/mesecons_lamp/init.lua
@@ -17,7 +17,7 @@ minetest.register_node("mesecons_lamp:lamp_on", {
 	legacy_wallmounted = true,
 	sunlight_propagates = true,
 	walkable = true,
-	light_source = default.LIGHT_MAX - 1,
+	light_source = LIGHT_MAX,
 	node_box = mesecon_lamp_box,
 	selection_box = mesecon_lamp_box,
 	groups = {dig_immediate=3,not_in_creative_inventory=1, mesecon_effector_on = 1},
diff --git a/mods/mesecons/mesecons_lightstone/init.lua b/mods/mesecons/mesecons_lightstone/init.lua
index da7cc41e..db34249e 100644
--- a/mods/mesecons/mesecons_lightstone/init.lua
+++ b/mods/mesecons/mesecons_lightstone/init.lua
@@ -31,7 +31,7 @@ function mesecon.lightstone_add(name, base_item, texture_off, texture_on)
 	tiles = {texture_on},
 	groups = {cracky=2,not_in_creative_inventory=1, mesecon = 2},
 	drop = "mesecons_lightstone:lightstone_" .. name .. "_off",
-	light_source = default.LIGHT_MAX-2,
+	light_source = LIGHT_MAX-2,
 	sounds = default.node_sound_stone_defaults(),
 	mesecons = {effector = {
 		rules = lightstone_rules,
diff --git a/mods/mesecons/mesecons_powerplant/init.lua b/mods/mesecons/mesecons_powerplant/init.lua
index a5e33272..33cedffc 100644
--- a/mods/mesecons/mesecons_powerplant/init.lua
+++ b/mods/mesecons/mesecons_powerplant/init.lua
@@ -9,7 +9,7 @@ minetest.register_node("mesecons_powerplant:power_plant", {
 	paramtype = "light",
 	walkable = false,
 	groups = {dig_immediate=3, mesecon = 2},
-	light_source = default.LIGHT_MAX-9,
+	light_source = LIGHT_MAX-9,
     	description="Power Plant",
 	selection_box = {
 		type = "fixed",
diff --git a/mods/mesecons/mesecons_pressureplates/init.lua b/mods/mesecons/mesecons_pressureplates/init.lua
index 0fda1f3d..b00db9a1 100644
--- a/mods/mesecons/mesecons_pressureplates/init.lua
+++ b/mods/mesecons/mesecons_pressureplates/init.lua
@@ -22,7 +22,7 @@ pp_on_timer = function (pos, elapsed)
 	if objs[1] == nil and node.name == basename .. "_on" then
 		minetest.add_node(pos, {name = basename .. "_off"})
 		mesecon.receptor_off(pos, mesecon.rules.pplate)
-	else
+	elseif node.name == basename .. "_off" then
 		for k, obj in pairs(objs) do
 			local objpos = obj:getpos()
 			if objpos.y > pos.y-1 and objpos.y < pos.y then
diff --git a/mods/mesecons/mesecons_torch/init.lua b/mods/mesecons/mesecons_torch/init.lua
index 5d1ad8f0..91f8e65b 100644
--- a/mods/mesecons/mesecons_torch/init.lua
+++ b/mods/mesecons/mesecons_torch/init.lua
@@ -76,7 +76,7 @@ minetest.register_node("mesecons_torch:mesecon_torch_on", {
 	paramtype2 = "wallmounted",
 	selection_box = torch_selectionbox,
 	groups = {dig_immediate=3},
-	light_source = default.LIGHT_MAX-5,
+	light_source = LIGHT_MAX-5,
 	description="Mesecon Torch",
 	mesecons = {receptor = {
 		state = mesecon.state.on,