For what's it's worth, the Silent Hunter IV game uses blue lights on the older boats like the Old S Class models. So, rigging for red is actually rigging for blue. It's kind of weird when you are so used to red.
Paul, I know that there are multiple light circuits in most compartments so that rigging for red was/is as simple as turning a few switches. Most of our light switches on the Batfish are still intact, but we keep chicken wire over them to keep visitors from playing with them - I need to do the same for the 1MC switches and knobs. I'm sure that Rick would let us have free access to the switches during a weekend tour event. It's just a matter of finding each "string" and putting the appropriate color bulb in each fixture. Most of our switches are still labeled. So, assuming that the boat lighting hasn't been rewired too much, port lights should be just that. Same for starboard.
I'm sure that the Batfsh had a lot more globes at one point, but it probably became a real pain to constantly have to unscrew the whole fixture to replace a burned out bulb. Most lights on the main [interior] deck are shaded or bare sockets. All lights below the main deck are bare sockets. Every time I get on the boat and see a new compact fluorescent bulb in an obvious location, I put it below decks or in a location that the public can't directly see, like the officer bunk lights. I'll then replace it with a clear or frosted bulb. My goal is to get compact fluorescent bulbs out of public view and in all of the below deck sockets to save the park money on electricity and increase bulb life.
We have been installing clear 60W bulbs to give the fixtures an antique look. I knew that they were the Mazda bulbs and were probably 40W or 50W, but I didn't realize that they were lightly frosted. It's a toss-up between authenticity and getting repeat customers. As much as I like authenticity, visitors wouldn't want to come onto a dingy, dimly-lit boat that smelled of sweat, oil, cigarettes, hamburger grease, etc. Plus, we work on the boat often enough that I welcome a bright light above my head when Im trying to see into a dark, dusty electronics cabinet.