After the success of the Zeitwerk Luminous, which is currently still backordered around the world, A. Lange & Söhne illuminated the Grand version of its most iconic timepiece, the Lange 1. This time, its called Lumen, instead of Luminous, but the effect is the same. A smoke sapphire crystal dial allows a view into the movement, from the front side. Luminous paint was used for the markers, hands and on Lange’s patent date display. This gives the watch a totally different look.