At Firey Knights II, and again at Golden Flight, Baronessa Ginevra taught how to make dipped beeswax candles.
Across most of the period we cover, beeswax is an appropriate and good option for candles. It casts a brighter, clearer light then rushlights, so you can read or work by it, and it doesn’t drip as much as the modern alternatives of paraffin wax or soy. Dip candles use less wax than some other means of candle production, and are simple to produce – just ask the children who made their own!
(Thanks are due to Ladies Gisla and Vigdis for the photos of their candles, because Ginevra realised she forgot to take any during the classes)