Make Stairs+ nodes emit slightly less light compared to full nodes

This makes up for their smaller visual size.

CHANGELOG.md

@@ -14,6 +14,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Changed
 
+- Stairs+ nodes now emit one light level less compared to full nodes to make up
+  for their smaller visual size.
 - The minimum supported Minetest version is now 5.0.0.
 
 ## [1.3.0] - 2019-03-23

stairsplus/common.lua

@@ -35,6 +35,9 @@ stairsplus.register_single = function(category, alternate, info, modname, subnam
 	-- This makes node rotation work on placement
 	def.place_param2 = nil
 
+	-- Darken light sources slightly to make up for their smaller visual size
+	def.light_source = math.max(0, (def.light_source or 0) - 1)
+
 	def.on_place = minetest.rotate_node
 	def.groups = stairsplus:prepare_groups(fields.groups)
 

stairsplus/init.lua

@@ -14,8 +14,10 @@ stairsplus.expect_infinite_stacks = false
 
 stairsplus.shapes_list = {}
 
-if not minetest.get_modpath("unified_inventory")
-and minetest.settings:get_bool("creative_mode") then
+if
+	not minetest.get_modpath("unified_inventory")
+	and minetest.settings:get_bool("creative_mode")
+then
 	stairsplus.expect_infinite_stacks = true
 end
 
@@ -36,7 +38,7 @@ end
 
 function stairsplus:register_all(modname, subname, recipeitem, fields)
 	self:register_stair(modname, subname, recipeitem, fields)
-	self:register_slab (modname, subname, recipeitem, fields)
+	self:register_slab(modname, subname, recipeitem, fields)
 	self:register_slope(modname, subname, recipeitem, fields)
 	self:register_panel(modname, subname, recipeitem, fields)
 	self:register_micro(modname, subname, recipeitem, fields)