In one of my former and short lives as a worker bee, I was involved with a company that had a joint venture partner in Estonia. Guess who was listed as the operations manager of "international" operations.
We sold them computers and some shotguns via Belgium.
They had a very nice gun store in Tallin that sold a variety of first rate arms when the Avg Yrly salary in Estonia was about 700 bucks.
On an overnight trip to and from, I stayed at one of the principals house which was very nice, but not that very nice by our standards of rich.
Given jet lag, I couldn't sleep and went downstairs to watch some TV (even if in a foreign language).
I didn't want to awake the family which was on the first floor, so I did not turn on the lights.
In the semi dark, I bumped into their in home security system (not an electronic system like we have here), It was a former Russian Army or KGB Commando) who didn't cut my throat or something as fun as that, since he (I guess "it" was a he as I could not see him), knew I was to be there.
He muttered something in Russian or Estonian, in a polite tone, and I also did in English.
He disappeared back into the night.
I turned on the TV, watched for a time, and went back and tried to get some sleep, as I was to leave the next morning.
Just a FYI story of what did happen once upon a time.
As to lights on or off. I say turn em on, bright and white.
You never know when there could be an Ex KGB or Russian Army Commando, or nowadays some no good bumb or terrorist type who is just waiting to slit your throat ( Why shoot you and make a noise that will awake the family?
)
And if that is their intent, you will be at a distinct disadvantage with the lights out, unless you are some type of Ninja who is an expert in night work.