diff --git a/core/src/io/anuke/mindustry/core/Renderer.java b/core/src/io/anuke/mindustry/core/Renderer.java
index 7843f86719..2778930583 100644
--- a/core/src/io/anuke/mindustry/core/Renderer.java
+++ b/core/src/io/anuke/mindustry/core/Renderer.java
@@ -300,7 +300,9 @@ public class Renderer implements ApplicationListener{
 
         playerGroup.draw(p -> !p.isDead(), Player::drawName);
 
-        lights.draw();
+        if(state.rules.darkness){
+            lights.draw();
+        }
 
         drawLanding();
 
diff --git a/core/src/io/anuke/mindustry/game/Rules.java b/core/src/io/anuke/mindustry/game/Rules.java
index 98d9cb978c..17a2cc99c4 100644
--- a/core/src/io/anuke/mindustry/game/Rules.java
+++ b/core/src/io/anuke/mindustry/game/Rules.java
@@ -2,6 +2,7 @@ package io.anuke.mindustry.game;
 
 import io.anuke.annotations.Annotations.*;
 import io.anuke.arc.collection.*;
+import io.anuke.arc.graphics.*;
 import io.anuke.mindustry.content.*;
 import io.anuke.mindustry.io.*;
 import io.anuke.mindustry.type.*;
@@ -73,6 +74,10 @@ public class Rules{
     public Array<ItemStack> loadout = Array.with(ItemStack.with(Items.copper, 100));
     /** Blocks that cannot be placed. */
     public ObjectSet<Block> bannedBlocks = new ObjectSet<>();
+    /** Whether everything is dark. Enables lights. Exeperimental. */
+    public boolean darkness = true;
+    /** Ambient light color, used when darkness is enabled. */
+    public Color ambientLight = new Color(0.01f, 0.01f, 0.04f, 0.99f);
 
     /** Copies this ruleset exactly. Not very efficient at all, do not use often. */
     public Rules copy(){
diff --git a/core/src/io/anuke/mindustry/graphics/LightRenderer.java b/core/src/io/anuke/mindustry/graphics/LightRenderer.java
index cdff26866d..cca25df62a 100644
--- a/core/src/io/anuke/mindustry/graphics/LightRenderer.java
+++ b/core/src/io/anuke/mindustry/graphics/LightRenderer.java
@@ -9,6 +9,9 @@ import io.anuke.arc.math.*;
 import io.anuke.arc.math.geom.*;
 import io.anuke.arc.util.*;
 
+import static io.anuke.mindustry.Vars.state;
+
+/** Renders overlay lights. Client only. */
 public class LightRenderer{
     private static final int scaling = 4;
     private float[] vertices = new float[24];
@@ -16,10 +19,14 @@ public class LightRenderer{
     private Array<Runnable> lights = new Array<>();
 
     public void add(Runnable run){
+        if(!enabled()) return;
+
         lights.add(run);
     }
 
     public void add(float x, float y, float radius, Color color, float opacity){
+        if(!enabled()) return;
+
         float res = color.toFloatBits();
         add(() -> {
             Draw.color(res);
@@ -29,6 +36,8 @@ public class LightRenderer{
     }
 
     public void add(float x, float y, TextureRegion region, Color color, float opacity){
+        if(!enabled()) return;
+
         float res = color.toFloatBits();
         add(() -> {
             Draw.color(res);
@@ -38,6 +47,8 @@ public class LightRenderer{
     }
 
     public void line(float x, float y, float x2, float y2){
+        if(!enabled()) return;
+
         add(() -> {
             Draw.color(Color.orange, 0.5f);
 
@@ -158,6 +169,10 @@ public class LightRenderer{
         });
     }
 
+    public boolean enabled(){
+        return state.rules.darkness;
+    }
+
     public void draw(){
         if(buffer.getWidth() != Core.graphics.getWidth()/scaling || buffer.getHeight() != Core.graphics.getHeight()/scaling){
             buffer.resize(Core.graphics.getWidth()/scaling, Core.graphics.getHeight()/scaling);
@@ -174,6 +189,7 @@ public class LightRenderer{
         buffer.endDraw();
 
         Draw.color();
+        Shaders.light.ambient.set(state.rules.ambientLight);
         Draw.shader(Shaders.light);
         Draw.rect(Draw.wrap(buffer.getTexture()), Core.camera.position.x, Core.camera.position.y, Core.camera.width, -Core.camera.height);
         Draw.shader();
diff --git a/core/src/io/anuke/mindustry/world/blocks/power/NuclearReactor.java b/core/src/io/anuke/mindustry/world/blocks/power/NuclearReactor.java
index 1bc9e3b4c0..ca36dbf171 100644
--- a/core/src/io/anuke/mindustry/world/blocks/power/NuclearReactor.java
+++ b/core/src/io/anuke/mindustry/world/blocks/power/NuclearReactor.java
@@ -27,7 +27,7 @@ public class NuclearReactor extends PowerGenerator{
 
     protected final Vector2 tr = new Vector2();
 
-    protected Color lightColor = Color.valueOf("b174f1");
+    protected Color lightColor = Color.valueOf("7f19ea");
     protected Color coolColor = new Color(1, 1, 1, 0f);
     protected Color hotColor = Color.valueOf("ff9575a3");
     protected float itemDuration = 120; //time to consume 1 fuel