Size matters when it comes to candles.  The size of the candle determines if the candle scent is evenly distributed throughout a room. Smaller 4oz candles are best used in small spaces such as a bathroom, laundry room or office.  Medium 8oz candles are best used in spaces such as a dining room or living room that is not open.  Larger 12oz or 16oz candles are best used in an open living room or other large open spaces.  Multiple medium or smaller candles will produce just as much scent.  How many will depend on the size of the room.