How did wall sconces increase candlelight in large medieval houses?

In large medieval houses, wall sconces—often referred to in period inventories as "plate candlesticks"—were used to supplement other lighting fixtures like chandeliers and candlebeams. These sconces were typically crafted from silver or brass and were specifically designed with reflectors positioned behind the candles to intensify and project the light into the room.1

While the practice of using mirrors or looking glasses as highly effective reflectors became more common in the late 17th century, the earlier medieval versions relied on metal plates to serve this purpose. By mounting these reflective fixtures on the walls, households could better illuminate the expansive spaces of their long halls.231