In this video, this guy shows how you can produce light, with only regular water, a flask and ultrasound.

It looks like he has catched a start in his flask of Water lol ( 2:07 in his video)

https://www.youtube.com/watch?v=puVxGnl_3y8&ab_channel=TheThoughtEmporium

Mantras also use sound to create Light aka Energy, just a nice parallel between science and spirituality ^^