What is the difference between Super-LumiNova® C3 and Super-LumiNova® BG W9? 28 July 2023 12:56 Updated Super-LumiNova® C3 is slightly greenish with a green afterglow, BG W9 is white with a bluish afterglow. C3 is slightly more luminescent than BG W9. Related articles What affects the luminosity of the Super-LumiNova® in my watch? Why are the majority of sapphire crystals only anti-reflective on the inside? How accurate are Oris watches? What is sapphire crystal? What are your bracelets and straps made of?