Here's a lighthouse with functioning light, flood lights and keeper's hut. This isn't completely symmetrical, so some things got a little wonky. But don't look too close and it looks pretty cool. This was mostly made in survival but you may have to place it in creative to get the big light the way I made it because it's enlarged beyond what you can do in survival. The flood lights are cool for making the building stand out at night, but during the day they are completely blown out.
The big light is the rotating lamp inside a luminant sphere. You can turn on both to that you get at least some effect of a real lighthouse. Also the red lamp on top. I had fun making this!