Key Highlights
The Lange 1 Tourbillon Perpetual Calendar “Lumen” pairs the brand’s signature asymmetric layout with a tourbillon, perpetual calendar and outsize date. A semi-transparent luminous sapphire dial reveals and charges the calendar indications, while the self-winding calibre L225.1 delivers a 50-hour power reserve through its central rotor. The moon-phase with integrated day/night indication tracks the lunar orbit to within one day over 122.6 years. Limited to 50 watches in 950 platinum, the model was presented at Watches and Wonders 2026.
A Lumen Interpretation of the Lange 1
The Lange 1 Tourbillon Perpetual Calendar “Lumen” reworks the off-centre Lange 1 architecture to accommodate a tourbillon and full perpetual calendar beneath a partially transparent sapphire dial. The asymmetric layout and outsize date remain intact; indications are redistributed to integrate the calendar alongside a tourbillon that sits concealed from the dial side.
Months appear on a rotating peripheral ring with a leap-year aperture at 6 o’clock, and all calendar indications jump instantaneously at midnight. Adjustments can be made collectively or via correctors in the case flank, with the first manual correction not due until 1 March 2100.
Contrast, Transparency and Night-Time Presence
The coated, semi-transparent sapphire dial allows UV light to charge luminous elements across the outsize date, leap-year display and other indications, keeping them fully legible in darkness while maintaining a layered view into the movement. Luminous numerals, scales, hands and moon accents sustain that clarity through the night.
The 950 platinum case frames the dark dial and hand-stitched black alligator strap, with rhodiumed-gold hands and appliques providing sharp contrast. Alternating polished and satin-finished surfaces articulate the architecture and reinforce legibility.
Complications in Luminous Detail
The luminous outsize date anchors the dial, its tens cross and units disc glowing through the semi-transparent surface and jumping at midnight — the leap-year display at 6 o’clock operates on the same principle. A retrograde day-of-week display and the peripheral month ring complete the perpetual calendar, with case-flank correctors available for precise individual adjustment.
The moon-phase with integrated day/night indication uses a disc rotating once every 24 hours, accumulating an error of just one day over 122.6 years.
Calibre L225.1: Engineering and Finissage
The self-winding calibre L225.1 consolidates tourbillon, perpetual calendar, moon-phase and outsize date within the 41.9 mm by 13.0 mm platinum case, readable both through the dial and via the sapphire-crystal back. Plates and bridges carry perlage, solarisation, straight graining and circular graining throughout, with chamfered and polished edges on every component.
An inscription at 12 o’clock marks the tourbillon’s position on the dial side; from the back, the carriage completes one rotation per minute. The balance, fitted with eccentric poising weights and an in-house balance spring, oscillates at 21,600 semi-oscillations per hour. A patented stop-seconds mechanism with a V-shaped arresting spring halts the tourbillon for precise hand-setting.
A central rotor in 18-carat white gold appears here for the first time in a Lange calibre, paired with an outer 950 platinum mass to enhance winding efficiency and secure the 50-hour power reserve. The dark black-rhodiumed central segment contrasts with the lighter platinum ring, while the stainless-steel tourbillon cock and intermediate-wheel cock carry black polish, hand-engraved stars, a shooting star and a diamond endstone set in a screwed gold chaton.
The watch is cased in 950 platinum with sapphire crystal and transparent caseback, a luminous coated sapphire dial, rhodiumed 750-gold hands and a hand-stitched black alligator leather strap with quick-lock deployant buckle. Edition engraving on the case confirms the 50-piece limitation; the model debuted at Watches and Wonders 2026 in Geneva.
Why It Matters
Uniting a tourbillon, instantaneous perpetual calendar and luminous architecture within a platinum Lange 1, this watch speaks directly to collectors for whom mechanical depth, legibility and scarcity are non-negotiable. The 50-piece limitation and calibre L225.1 position it as a considered choice for connoisseurs seeking a German answer to the benchmark high complications.
Frequently Asked Questions
What makes the Lange 1 Tourbillon Perpetual Calendar Lumen’s dial unique?
The semi-transparent luminous sapphire dial allows UV light to charge the glowing calendar indications and outsize date, keeping them legible in the dark while preserving the signature Lange 1 asymmetric geometry and revealing the mechanism beneath.
How long does the perpetual calendar function without manual adjustment?
The perpetual calendar requires no manual correction until 1 March 2100, with the moon-phase and integrated day/night indication calculated for a 122.6-year accuracy before needing adjustment.
What is the power reserve of the calibre L225.1?
The self-winding calibre L225.1 features a central rotor paired with an outer 950 platinum mass that delivers a 50-hour power reserve, marking the first appearance of a central rotor in a Lange movement.
