Maybe a hot take but I'll see what people think.
I don't think the name Pyrotechnic Control is a good fit for this powerset. It implies an origin to the powers, with that being something man-made and generally restricts 3/5 of the in-game origins. The visuals and animations don't show anything that supports the firework namesake, which is how it should be to allow for player concepts to takeover. Additionally, it is uncharacteristically specific in a game that tries to have elemental set names (ice, fire, time, etc.).
As for a replacement name, I don't think this set is Light Control (or Flare, Glitter, Sparkle...), especially with the Blow Up mechanic. I'd suggest Explosion or Detonation Control, because that seems to split the design of the set with being elemental enough to satisfy the sandbox concept crowd.
Then again, I'm the weirdo that rerolls at all levels to change origins and names in games that don't allow name changes (thank you Homecoming).