I would interpret this image the 7 lighted sticks on the first image of the Grandes Chroniques de France 1332-1350 (http://www.bl.uk/manuscripts/Viewer...s_16_g_vi_f181v
) as twisted beeswax candles made of two strings of beeswax wisted around each other. As shown on this younger illustrations from the Constance Council in 1465 showing clergymen distributing such hallowed candles or the third image of Friedrich Pacher from Brunek dated to 1480 showing St. Blasius with such a twisted candle. This type of candles is very common in the european medieval period. These images are the ones I had at hand, but there are also older images present.
And there are also exists some contemporary written sources about this special type of twisted candles.