To say the lume on this dial took me by surprise was an understatement. As a lume junkie, I consider Seiko dive watch lume to be pretty much the gold standard. Most watch parts with lume sold on the internet are what I consider fakers. They put up a good show for 5-10 mins and they poop out. Kudos to the Lucius team! I dunno what they put on this dial, but it shines with my Seiko samurais, monsters, and Zelos Swordfish all through the night. The initial glow is nice, but the true test is checking it hours later, and this dial holds up! Wouldn't hesitate to buy another dial here. Now, if only your team would produce a chapter ring with equal lume quality. Please consider this. The LCBI lumed chapter ring is a faker. It goes dark in no time.