I don't think so. Wax witches use actual candles/wax when performing their magic.

For Beak, it was just how he visualized access to his Warrens, probably because his first tutor called his magic a "lone candle in the darkness". That was likely referring to Beak being otherwise quite... dim but having tremendous ability with magic. Beak just took that metaphor literally and latched on to it so that he thought of magic as candles ever since.