diff --git a/src/ign_world/world/world.sdf b/src/ign_world/world/world.sdf
index 53b45cc..29d706c 100644
--- a/src/ign_world/world/world.sdf
+++ b/src/ign_world/world/world.sdf
@@ -12,24 +12,27 @@
         <light type="point" name="point_light_1">
             <cast_shadows>true</cast_shadows>
             <pose>1 1 2.5 0 0 0</pose>
+            <visualize>false</visualize>
         </light>
         
         <light type="point" name="point_light_2">
             <cast_shadows>true</cast_shadows>
             <pose>5 1 2.5 0 0 0</pose>
+            <visualize>false</visualize>
         </light>
         
         <light type="point" name="point_light_3">
             <cast_shadows>true</cast_shadows>
             <pose>1 5 2.5 0 0 0</pose>
+            <visualize>false</visualize>
         </light>
         
         <light type="point" name="point_light_4">
             <cast_shadows>true</cast_shadows>
             <pose>5 5 2.5 0 0 0</pose>
+            <visualize>false</visualize>
         </light>
         
-        
         <actor name="actor_walking">
             <plugin name="ignition::gazebo::ActorSystem" filename="$(find ign_actor_plugin)/libign_actor_plugin.so">
                 <x>2</x>
diff --git a/src/iisy_config/stl/link_2_bottom_low.stl b/src/iisy_config/stl/link_2_bottom_low.stl
old mode 100755
new mode 100644
index 94af640..0642061
Binary files a/src/iisy_config/stl/link_2_bottom_low.stl and b/src/iisy_config/stl/link_2_bottom_low.stl differ