diff --git a/apps/amethyst/lib/apps/connection_handler.ex b/apps/amethyst/lib/apps/connection_handler.ex
index 772a054..8b94be1 100644
--- a/apps/amethyst/lib/apps/connection_handler.ex
+++ b/apps/amethyst/lib/apps/connection_handler.ex
@@ -153,69 +153,94 @@ defmodule Amethyst.ConnectionHandler do
     heightmaps = compound(%{})
 
     data = Enum.chunk_every(chunk_array, 16, 16, 0) # 0 -> air
-        |> Enum.reduce("", fn chunk_section, acc ->
-          blocks = chunk_section |> List.flatten()
-          block_count = blocks |> Enum.filter(&(&1 != 0)) |> length
+      |> Enum.reduce("", fn chunk_section, acc ->
+        blocks_and_lights = chunk_section |> List.flatten()
+        block_count = blocks_and_lights |> Enum.filter(fn {bs, _, _} -> bs != 0 end) |> length
 
-          # Put together the palette
-          unique_blocks = MapSet.new(blocks)
-          min_bpe = MapSet.size(unique_blocks) |> :math.log2() |> ceil()
-          paletted_container_data = case min_bpe do
-            0 ->
-            # SINGLE VALUED
-              Write.ubyte(0) <>
-              Write.varint(MapSet.to_list(unique_blocks) |> List.first()) <>
-              Write.varint(0) # No data, empty pallette
-            min_bpe when min_bpe in 1..8 ->
-            # INDIRECT
-              # Minimum bpe accepted by minecraft is 4
-              bpe = max(min_bpe, 4)
-              palette = MapSet.to_list(unique_blocks) |>
-                Enum.with_index() |>
-                Map.new(fn {i, v} -> {i, v} end)
-              paletted_blocks = blocks |>
-                Enum.map(&(Map.get(palette, &1)))
-              paletted_data = long_aligned_bit_string_reduce(paletted_blocks, bpe)
+        # Put together the palette
+        unique_blocks = MapSet.new(blocks_and_lights |> Enum.map(fn {bs, _, _} -> bs end))
+        min_bpe = MapSet.size(unique_blocks) |> :math.log2() |> ceil()
 
-              Write.ubyte(bpe) <>
-              Write.varint(map_size(palette)) <>
-              Enum.reduce(palette, "", fn {_k, v}, acc ->
-                acc <> Write.varint(v)
-              end) <>
-              Write.varint(floor(bit_size(paletted_data) / 64)) <>
-              paletted_data
-            _ ->
-            # DIRECT
-              data = long_aligned_bit_string_reduce(blocks, 15)
-              Write.ubyte(15) <>
-              Write.varint(floor(bit_size(data) / 64)) <>
-              data
-          end
+        paletted_container_data = case min_bpe do
+          0 ->
+          # SINGLE VALUED
+            Write.ubyte(0) <>
+            Write.varint(MapSet.to_list(unique_blocks) |> List.first()) <>
+            Write.varint(0) # No data, empty pallette
 
-          acc <> Write.short(block_count) <> paletted_container_data <>
-          <<0::8, 0::8, 0::8>> # TODO: This should be biome data
-        end)
+          min_bpe when min_bpe in 1..8 ->
+          # INDIRECT
+            # Minimum bpe accepted by minecraft is 4
+            bpe = max(min_bpe, 4)
+            palette = MapSet.to_list(unique_blocks) |>
+              Enum.with_index() |>
+              Map.new(fn {v, i} -> {v, i} end)
+            paletted_blocks = blocks_and_lights |>
+              Enum.map(fn {bs, _, _} -> Map.get(palette, bs) end)
+            paletted_data = long_aligned_bit_string_reduce(paletted_blocks, bpe,
+              fn bs -> <<bs::signed-integer-big-size(bpe)>> end)
+            Write.ubyte(bpe) <>
+            Write.varint(map_size(palette)) <>
+            (Enum.sort(palette, fn {_k1, v1}, {_k2, v2} -> v1 < v2 end) |>
+              Enum.reduce("", fn {k, _v}, acc -> acc <> Write.varint(k) end)) <>
+            Write.varint(floor(bit_size(paletted_data) / 64)) <>
+            paletted_data
 
-      send(to, {:send_packet, %{
-        packet_type: :chunk_data_and_update_light,
-        chunk_x: cx, chunk_z: cz,
-        heightmaps: heightmaps,
-        data: data,
-        block_entities: [],
-        # TODO: Light
-        sky_light_mask: Write.varint(0),
-        block_light_mask: Write.varint(0),
-        empty_sky_light_mask: Write.varint(0),
-        empty_block_light_mask: Write.varint(0),
-        sky_light_arrays: [],
-        block_light_arrays: []
-      }})
-      :ok
+          _ ->
+          # DIRECT
+            data = long_aligned_bit_string_reduce(blocks_and_lights, 15,
+              fn {bs, _sl, _bl} -> <<bs::signed-integer-big-size(15)>> end)
+            Write.ubyte(15) <>
+            Write.varint(floor(bit_size(data) / 64)) <>
+            data
+        end
+
+        acc <> Write.short(block_count) <> paletted_container_data <>
+        <<0::8, 0::8, 0::8>> # TODO: This should be biome data
+      end)
+
+  sky_light_sections = Enum.chunk_every(chunk_array, 16, 16, 0)
+      |> Enum.map(fn chunk_section ->
+        chunk_section |> List.flatten() |> Enum.map(fn {_bs, sl, _bl} -> sl end)
+      end)
+  non_empty_sky_light_sections = sky_light_sections |> Enum.filter(fn section -> !Enum.all?(section, &(&1 == 0)) end)
+  has_sky_light = [false] ++ (sky_light_sections |> Enum.map(fn section -> !Enum.all?(section, &(&1 == 0)) end)) ++ [false]
+  empty_sky_light = has_sky_light |> Enum.map(&not/1)
+  sky_light_array = non_empty_sky_light_sections |> Enum.map(&(Enum.reduce(&1, <<>>, fn light, acc ->
+    <<acc::bitstring, light::size(4)>>
+  end)))
+
+  block_light_sections = Enum.chunk_every(chunk_array, 16, 16, 0)
+  |> Enum.map(fn chunk_section ->
+    chunk_section |> List.flatten() |> Enum.map(fn {_bs, _sl, bl} -> bl end)
+  end)
+  non_empty_block_light_sections = block_light_sections |> Enum.filter(fn section -> !Enum.all?(section, &(&1 == 0)) end)
+  has_block_light = [false] ++ (block_light_sections |> Enum.map(fn section -> !Enum.all?(section, &(&1 == 0)) end)) ++ [false]
+  empty_block_light = has_block_light |> Enum.map(&not/1)
+  block_light_array = non_empty_block_light_sections |> Enum.map(&(Enum.reduce(&1, <<>>, fn light, acc ->
+    <<acc::bitstring, light::size(4)>>
+  end)))
+
+  send(to, {:send_packet, %{
+    packet_type: :chunk_data_and_update_light,
+    chunk_x: cx, chunk_z: cz,
+    heightmaps: heightmaps,
+    data: data,
+    block_entities: [],
+    sky_light_mask: has_sky_light,
+    block_light_mask: has_block_light,
+    empty_sky_light_mask: empty_sky_light,
+    empty_block_light_mask: empty_block_light,
+    sky_light_arrays: sky_light_array |> Enum.map(&(%{sky_light_array: &1})),
+    block_light_arrays: block_light_array |> Enum.map(&(%{block_light_array: &1}))
+  }})
+  :ok
   end
 
-  defp long_aligned_bit_string_reduce(values, bpe) do
+  defp long_aligned_bit_string_reduce(values, bpe, func) do
     values |> Enum.reduce(<<>>, fn value, acc ->
-      next = <<acc::bitstring, value::big-size(bpe)>>
+      ret = func.(value)
+      next = <<acc::bitstring, ret::bitstring-size(bpe)>>
       # man i hope they dont suddenly change the size of a long
       if rem(bit_size(next), 64) + bpe > 64 do
         # gotta pad it
diff --git a/apps/amethyst/lib/data.ex b/apps/amethyst/lib/data.ex
index 12fd126..49fdb31 100644
--- a/apps/amethyst/lib/data.ex
+++ b/apps/amethyst/lib/data.ex
@@ -16,6 +16,7 @@
 
 defmodule Amethyst.Minecraft.Write do
   import Bitwise
+  require Logger
 
   @moduledoc """
   This module contains functions for writing Minecraft data.
@@ -139,6 +140,18 @@ defmodule Amethyst.Minecraft.Write do
   def nbt(value) do
     Amethyst.NBT.Write.write_net(value)
   end
+
+  def bitset(list) do
+    Logger.debug("Writing bitset #{inspect(list)}")
+    unaligned = Enum.reduce(list, <<>>, &(if &1 do <<&2::bitstring, 1::1>> else <<&2::bitstring, 0::1>> end))
+    aligned = if rem(bit_size(unaligned), 64) == 0 do
+      unaligned
+    else
+      <<unaligned::bitstring, 0::size(64 - rem(bit_size(unaligned), 64))>>
+    end
+    Logger.debug("Writing as #{inspect(aligned)}")
+    varint(div(byte_size(aligned), 8)) <> aligned
+  end
 end
 
 defmodule Amethyst.Minecraft.Read do
diff --git a/apps/amethyst/lib/game.ex b/apps/amethyst/lib/game.ex
index cebfd9c..08792ef 100644
--- a/apps/amethyst/lib/game.ex
+++ b/apps/amethyst/lib/game.ex
@@ -92,7 +92,7 @@ defmodule Amethyst.Game do
 
   For now, this data must be formatted as a 3D list, indexed as [y][z][x].
   """
-  @callback chunk(from :: pid(), {x :: integer(), z :: integer()}, state_refs :: map()) :: [[[pos_integer()]]]
+  @callback chunk(from :: pid(), {x :: integer(), z :: integer()}, state_refs :: map()) :: [[[{block_state :: pos_integer(), sky_light :: 0..15, block_light :: 0..15}]]]
   def chunk(%{:mod => mod, :refs => refs}, pos) do
     mod.chunk(self(), pos, refs)
   end
diff --git a/apps/amethyst/lib/states/macros.ex b/apps/amethyst/lib/states/macros.ex
index 0f40a0d..d1644e4 100644
--- a/apps/amethyst/lib/states/macros.ex
+++ b/apps/amethyst/lib/states/macros.ex
@@ -154,6 +154,7 @@ defmodule Amethyst.ConnectionState.Macros do
   def type_matches(value, {:optional, _type}) when is_nil(value), do: true
   def type_matches(value, {:optional, type}), do: type_matches(value, type)
   def type_matches(value, {:array, signature}) when is_list(value), do: Enum.all?(value, fn item -> check_type(item, signature) end)
+  def type_matches(value, :bitset) when is_list(value), do: Enum.all?(value, fn item -> is_boolean(item) end)
   def type_matches(value, {:compound, signature}) when is_map(value), do: check_type(value, signature)
   def type_matches(_, _) do
     false
diff --git a/apps/amethyst/lib/states/play.ex b/apps/amethyst/lib/states/play.ex
index b1730e7..3c95619 100644
--- a/apps/amethyst/lib/states/play.ex
+++ b/apps/amethyst/lib/states/play.ex
@@ -36,10 +36,10 @@ defmodule Amethyst.ConnectionState.Play do
       type: :varint,
       data: :nbt
     ]},
-    sky_light_mask: :raw,
-    block_light_mask: :raw,
-    empty_sky_light_mask: :raw,
-    empty_block_light_mask: :raw,
+    sky_light_mask: :bitset,
+    block_light_mask: :bitset,
+    empty_sky_light_mask: :bitset,
+    empty_block_light_mask: :bitset,
     sky_light_arrays: {:array, [
       sky_light_array: :byte_array
     ]},
diff --git a/apps/example_game/lib/example/game.ex b/apps/example_game/lib/example/game.ex
index 62dce35..ec8b67a 100644
--- a/apps/example_game/lib/example/game.ex
+++ b/apps/example_game/lib/example/game.ex
@@ -46,13 +46,13 @@ defmodule Example.Game do
     (0..255) |> Enum.map(fn y ->
       (0..15) |> Enum.map(fn z ->
         (0..15) |> Enum.map(fn x ->
-          gx = cx*16 + x
-          gz = cz*16 + z
+          gx = cx * 16 + x
+          gz = cz * 16 + z
           gy = y
           if rem(gx, 4) == 0 && rem(gy, 4) == 0 && rem(gz, 4) == 0 do
-            1
+            {abs(rem(div(gx + gy + gz, 4), 1000)), 15, 0}
           else
-            0
+            {0, 15, 0}
           end
         end)
       end)