Delma Oceanmaster Lume: Full-Lume Dive Watch with BGW9 and C1 Super-LumiNova
When Lume Becomes the Star of the Show
Most watches use lume as a supporting player — a practical feature for low-light reading. Delma has flipped that script with the Oceanmaster Lume, a sailing-oriented dive watch where the entire dial is the lume. This is a watch designed to look as impressive in complete darkness as it does in broad daylight.
Three Types of Lume, One Watch
The Oceanmaster Lume is a masterclass in lume layering, employing three distinct types of Super-LumiNova to create depth and contrast in the dark:
- Dial Surface: Fully coated in turquoise Super-LumiNova that emits a matching blue glow
- Hour Markers: Filled with BGW9 Super-LumiNova — appears white in daylight, emits aqua blue in the dark
- Hands: Treated with green-glowing C1 Super-LumiNova for contrast against the dial
This combination ensures that even in pitch darkness, the hands remain distinguishable from the dial and markers — a critical legibility requirement for both sailing and diving.
Technical Specifications
| Specification | Detail |
| Case | 44mm × 13.8mm, 316L stainless steel |
| Water Resistance | 500 meters |
| Dial Lume | Full turquoise Super-LumiNova coating |
| Marker Lume | BGW9 (white day / aqua blue night) |
| Hand Lume | C1 (green glow) |
| Movement | Sellita SW200-1, 28,800vph, 41-hour PR |
| Bezel | Unidirectional 120-click, nautical scale |
| Colors | Blue, green, yellow, orange + white LE |
| Price | $1,650 USD |
Beyond Lume: Sailing Features
The Oceanmaster Lume isn't just a lume showpiece. It includes Delma's "tactical planner" dial markings — red and blue indicators with a central horizontal line and +/- markings that help sailors plan routes and determine optimal tacking directions relative to wind. The nautical-scale bezel features compass/degree markings for navigation, though the unidirectional 120-click action is more dive-oriented than sailing-optimized.
Build Quality and Movement
The 44mm case shares its architecture with Delma's Shell Star dive collection, delivering an impressive 500m water resistance and a helium escape valve — features borrowed from the diving world. Power comes from the reliable Sellita SW200-1 automatic movement, decorated with a gold-finished rotor visible through the display caseback.
Available on a matching stainless steel bracelet or FKM rubber strap, the Oceanmaster Lume offers serious tool-watch credentials at an accessible $1,650 price point.
Frequently Asked Questions
Q: What's the difference between BGW9 and C1 Super-LumiNova?
A: BGW9 appears white in daylight and glows aqua blue in the dark, making it ideal for hour markers on dark dials. C1 appears off-white/cream in daylight and emits a green glow, providing good contrast. The Oceanmaster Lume uses both to differentiate markers from hands.
Q: How does a full-lume dial perform compared to standard lume?
A: A fully luminous dial provides ambient light across the entire watch face, which can actually make the hands and markers easier to read in certain conditions. However, the overall brightness may not match concentrated lume on markers alone.
Q: Is the Oceanmaster Lume suitable for actual diving?
A: Absolutely. With 500m water resistance, a unidirectional timing bezel, and helium escape valve, it meets professional dive watch standards despite its sailing-oriented marketing.
According to aBlogtoWatch, the Delma Oceanmaster Lume "provides a thoroughly entertaining appearance in the dark" thanks to its generous application of multiple Super-LumiNova grades.
Want to learn more about lume technology? Read our complete guide to watch lume or compare BGW9 vs C3 Super-LumiNova.