Results from my computer research:
You researched folklore and demonology to find a match for the events that you and the others are experiencing. Your results seem to match a certain kind of demon. Some demons are attracted to houses or other buildings, and become attached to this location, and consider it their possession. They are often attracted to certain objects in the house, such as mirrors, sharp blades, dangerous equipment, or representations of human beings, like porcelain dolls. These objects will strengthen a demon.
This particular demon seems repelled by sources of light. That is not at all uncommon among demons. A photophobic demon will become weaker around light sources. However, over time, the demon will slowly begin to gain strength. If the strength of the demon overpowers the total strength of all the light in the room, the demon's power will overwhelm first the sources of light, then the victims inside the room.
The demon will often possess and inhabit the body of one, or even pose as a human and walk freely among them. It is possible to cast this demon out with an exorcism, but unless it is performed by a church official, this procedure becomes less effective as the demon gains in strength. Eventually not even an exorcism can drive the demon out, and it must be slain directly. In human form, the demon becomes vulnerable to this kind of attack.
However, when the demon is not confined to its body of flesh and blood, it is only vulnerable to light. It is strongest during the night, and can leave its body and inhabit others, controlling them and even forcing them to murder. Historically, this has been the explanation of thousands of people who have been accused of murder.... "the devil made me do it".
The name of the demon which most closely resembles this one, that you could find, is named Lucifuge.
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