1. A kit for illuminating a room when a door is completely opened, the kit comprising:a two-part contact switch comprising:
a door contact switch, connected to one member of a connection set consisting of the door and a structure connected to the door; and
a contact switch having a contact surface, configured to be mounted on one member of a mounted set consisting of a door track railing, a door opener track, and operator system; wherein an edge of the door contact switch rests upon the one member of the mounted set when the door is completely opened;
a light electrically connected to the door contact switch and mounted on an interior of the door; and
a power source electrically connected to the contact switch;
wherein when the door is completely opened, the contact surface of the contact switch makes contact with the door contact switch that completes a circuit, powers the light, in turn, illuminating the room.