Advice master? Is there a certain size ratio between the living room area and the ceiling lamp? For example, my living room area 17.5 square meters. What size ceiling lamp should I choose?

Generally speaking, there is no specific proportion of lamps, mainly depending on the height of the house (there are ceiling lamps and decorative chandeliers). Your living room is a common standard size, so the ceiling lamps in the general living room are suitable for your home. Just choose the style and color.