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 house a tourbillon and full perpetual calendar beneath a partially transparent sapphire dial. The asymmetric design and outsize date remain, while indications are rearranged so the calendar and a tourbillon concealed from the dial side can be integrated.
The 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 required on 1 March 2100.
Contrast, Transparency and Night-Time Presence
The coated, semi-transparent sapphire dial lets UV light charge luminous elements so the outsize date, leap-year display and other indications remain legible in the dark. Luminous numerals, scales, hands and moon accents ensure clarity at night while maintaining a layered view of the mechanism.
The 950 platinum case frames the dark dial and hand-stitched black alligator strap, with rhodiumed-gold hands and appliques providing contrast. Alternating polished and satin-finished surfaces emphasise the architecture and support legibility.
Complications in Luminous Detail
The luminous outsize date anchors the dial, with its tens cross and units disc visible beneath the semi-transparent surface as they glow and jump at midnight; the leap-year display at 6 o’clock works on the same principle. A retrograde day-of-week display and the peripheral month ring complete the perpetual calendar, while correctors on the case allow precise adjustment when required.
The moon-phase with integrated day/night indication uses a disc that turns once every 24 hours, tracking the moon’s orbit with a deviation of one day in 122.6 years.
Calibre L225.1: Engineering and Finissage
The self-winding calibre L225.1 unites tourbillon, perpetual calendar, moon-phase and outsize date within the 41.9 mm by 13.0 mm platinum case, and is visible both under the dial and through the sapphire-crystal back. Plates and bridges carry perlage, solarisation, straight graining and circular graining with chamfered, polished edges.
The tourbillon is indicated by an inscription at 12 o’clock on the dial and is seen from the back as its carriage turns once per minute. A balance with eccentric poising weights and an in-house balance spring oscillates at 21,600 semi-oscillations per hour, while a patented stop-seconds mechanism with a V-shaped arresting spring halts the tourbillon for precise 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 a 50-hour power reserve. The dark black-rhodiumed central segment contrasts with the lighter platinum ring, and the stainless-steel tourbillon cock and intermediate-wheel cock feature black polish, hand-engraved stars, a shooting star and a diamond endstone in a screwed gold chaton.
The watch is housed in a 950 platinum case 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 limitation to 50 watches, with the model presented at Watches and Wonders 2026 in Geneva.
Why It Matters
By uniting a tourbillon, instantaneous perpetual calendar and luminous architecture in a platinum Lange 1, this watch targets collectors who value mechanical depth, legibility and scarcity. The 50-piece limitation and calibre L225.1 position it as a focused choice for connoisseurs seeking a German alternative to 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.
