hw40

The hw40 was developed from the ground up and refined in close cooperation with our test team. The construction was modeled, simulated and optimized down to the last detail in CAD. The result is a compact, mechanically and electronically very robust lamp that is intended to serve even demanding tech divers as a primary lamp. The omission of a battery tank and cable makes the application particularly flexible and reliable – not only for sidemount divers. The hw40 also replaces a tank lamp when cave diving, provided the burn time is sufficient for the planned dive. Here, reliability is not a nice-to-have, but absolutely necessary.

The hw40 is produced in Germany on modern machining centers and is milled from solid POM and aluminum. All mechanical components are designed by us and manufactured according to our data and specifications. The electronics and software are of course also our own development, the circuit boards are assembled and tested here on site for us. Only brand-name components, sourced from official distributors, are used. This makes us less dependent on certain suppliers and enables us to offer the hw40 over a long product life cycle.

The LED is operated in the permissible working range, the temperatures on the LED and on the electronics are monitored. At the 10W and 5W levels, the lamp can also be operated unrestrictedly on the surface; at 20W and 40W, the power is automatically reduced after a few minutes so that no surface of the lamp heats up to >65°C (risk of burns). In the water, even at 30°C and more, the hw40 can of course also be operated at maximum power. LED, batteries and the power electronics are operated far below their maximum load capacity, ensuring a long service life for the components.

The batteries are actively balanced during charging, the charging current remains (temperature-dependent) significantly below the maximum permissible current. Charging is only carried out in the permitted temperature window (0-45°C) in accordance with the manufacturer’s specifications for the batteries. Harmful deep discharge is reliably prevented. The hw40 does not switch off spontaneously at any level, but slowly dims down and remains on at a greatly reduced brightness for at least 30 minutes. Enough time to switch to a backup lamp in peace – even in an exceptional situation.

The test depth of the hw40 is 300m, an 8mm borosilicate glass, stainless steel threaded bushings for attachment to the Goodman handle and a standard-compliant design of the seals and screw connections guarantee reliable function even in everyday cave diving. The lamp can be opened without tools for charging, the O-rings are easily accessible and can be easily checked and replaced. Two O-rings are used on all sealing levels. In the event of an unlikely pressure increase in the lamp (previous water ingress, thermal runaway of the battery cells), the plastic pins on the front part shear off in a controlled manner and prevent uncontrolled pressure relief.

The Goodman handle can be adjusted underwater without tools, an additional eyelet for a bolt snap carabiner (included) is attached to the housing and a pigtail for cave markers or a thumb loop can easily be attached to the base plate. The aluminum bracket, which is closed on both sides, can also be adjusted for very large or very small hands.