What Does "L-Swiss-L" Mean? (On a Watch Face)

Factual Questions
1

I know that “T-Swiss-T” means that the movement was made in Switzerland, and that the dial/hands contain tritium (to make them glow at night).
But what does the “L” stand for?

2

Apparently it means the luminous component is Super-LumiNova.

3

Dials that use SuperLuminova as the luminous material are marked “L Swiss L” or “L Swiss Made L”