Traitor/mods/lights/nodes.lua

local function register_basic(name, desc, light) --Registers node with same texture on all sides.
   light = light or 5
   minetest.register_node('lights:'..name, {
      description = desc,
      tiles = {{name='lights_'..name..'.png', align_style='world', scale=4}},
      inventory_image = '[inventorycube{lights_'..name..'.png&[sheet:4x4:1,1{lights_'..name..'.png&[sheet:4x4:1,1{lights_'..name..'.png&[sheet:4x4:1,1',
      groups = {breakable=1},
      light_source = light,
      sounds = {footstep = {name = glass, gain = .8}}
   })
end

register_basic('block_1', 'Light 1', 10)