A. Lange & Söhne has given the Lange 1 Tourbillon Perpetual Calendar its most theatrical treatment yet with a new platinum “Lumen” edition limited to 50 pieces.
The watch brings the Glashütte manufacture’s luminous sapphire-dial concept to the most complicated Lange 1, pairing a stop-seconds tourbillon with an instantaneous perpetual calendar, outsize date, moon phase and peripheral month display.
A platinum Lange 1 with a darker personality
The case measures 41.9mm across and 13mm thick, a modest increase over the regular model and still impressively contained given the mechanical load inside.
In platinum, the watch has the dense, deliberate feel that suits Lange particularly well, giving the already architectural Lange 1 layout a more imposing presence on the wrist.
This is the seventh watch in the Lumen line, a series that began in 2010 with the Zeitwerk “Luminous” and has since become one of Lange’s most collectible side chapters.
The Lumen dial is more than smoked sapphire
The dial is built from two sapphire crystal components treated with a semi-transparent titanium-oxide coating that lets ultraviolet light reach the luminous elements beneath while keeping the visible appearance dark and high-contrast.
That distinction matters because the watch does not simply look like a tinted skeleton dial; in daylight it has depth and restraint, while in darkness the calendar discs, hands, markers and moon phase ignite with a completely different character.
The Roman numerals and markers on the time display are made of solid gold, but luminous material is applied beneath the sapphire subdial so they appear classically applied by day and backlit after dark.
A moon phase with its own day-night theatre
The upgraded calibre L225.1 removes the former power-reserve indication and introduces a more expressive moon phase with an integrated day-night display.
Rather than using a conventional moon disc, Lange employs a carrier with two gold moons set above a separate 24-hour sky disc.
One half of that glass disc represents daytime, while the night section uses selectively opened star points over luminous material so the sky glows with layered intensity rather than flat brightness.
The effect is especially convincing in a Lumen watch because the complication is not just made visible; it becomes part of the nocturnal architecture of the dial.
The perpetual calendar still does the heavy lifting
Among Lange perpetual calendars, the Lange 1 Tourbillon Perpetual Calendar stands apart for its peripheral month ring, which preserves the asymmetrical Lange 1 display instead of crowding the dial with sub-registers.
The month indication circles the dial edge and also functions as a 12-month program cam, encoding the different month lengths through subtle changes in its contour.
A separate leap-year mechanism accounts for February in leap years, while the calendar indications advance instantaneously for the crisp mechanical choreography expected at this level.
The tourbillon adds another signature Lange flourish: it can be stopped for precise setting, a practical refinement on a complication often treated as purely visual.
Fifty pieces, all spoken for
The Lange 1 Tourbillon Perpetual Calendar “Lumen” is priced at €520,000, placing it firmly in the rarest tier of contemporary complicated watchmaking.
All 50 examples have already been allocated, which says plenty about the pull of the Lumen concept when matched with one of Lange’s most technically rich platforms.
For collectors, this is not merely a darker Lange 1 or a more luminous perpetual calendar; it is a rare instance where the display technology, movement architecture and collection lore reinforce one another.