Using only candles as lighting in this scene from Hereditary (2018)

The shot opens with the lady lighting a candle and gradually exposes more as the fire settles. It’s a beautifully simple shot. If you were to film this, what additionally lighting is required? Or is the candle the only source? I did see some subtle blue moonlight before the candle is lit (in the first image) and I’m guessing maybe there’s a soft reflector in the distance that is helping the candle distribute the light?