Sky Lights are similar to fireworks, only made with the One Power.
Captain Assid Bakuun laments the fact that the damane are ill and therefore unable to produce Sky Lights. He thinks that fireworks are a pitiful thing compared to Sky Lights. Matrim Cauthon tells Aludra that damane can make Sky Lights and that they make fireworks "look like a few sparks flying up the chimney." Aludra has not seen them and continues to create fireworks.