Three people in a dimly lit room.
The room is lit by candlelight.
The room could be dimly lit because of a dimmer or low watt bulbs. Dimly lit doesn't mean it was lit by candlelight and according to sentence number two I would assume no one was in the room.
exists s1 x1 x2.(a_topic(x1) & in(x1,x2) & n_room(x2) & a_lit(s1) & Theme(s1,x2) & r_dimly(x2) & n_people(x1) & card_eq_3(x1))
exists e1 x1 x2.(n_room(x1) & Actor(e1,x2) & n_candlelight(x2) & Theme(e1,x1) & v_light(e1))