Scary effects!

[plain dagger]

What you could do for this is use a Trigger Volume that covers the entire room
Then wire Player Entered to the Run port on a Delay configured to wait 5 seconds, then wire the output Run port to turn off all your lights, and wire After Delay to turn them back on

[plain dagger]

To make it dark you’ll have to edit the subroom settings and change Sunny Day to either Stunt Runner or Outer Space

Then spawn in point lights and there will be ports to turn them on and off