For this venue, Perfikot had already conducted a thorough survey; the hotel's lighting used candles and oil lamps, which were the most common lighting equipment of this era since electric lights had not yet appeared in this world.
So, there was no scene of a phantom thief extinguishing all the lights and then stealing the treasure under the cover of darkness.
Furthermore, Perfikot had installed a lantern on every Steam Knight for illumination, ensuring that even if all the lights in the venue were extinguished, the Steam Knights themselves could become a light source for illumination.
Not to mention the Flying Stone itself can emit light, making it the most conspicuous presence in a completely dark environment.
