Ammonite LED Nautilus Focusable Light Head
Ammonite Nautilus Focusable Light Head
Ammonite LED Nautilus Focusable Light Head
Ammonite LED Nautilus Focusable Light Head
Ammonite Nautilus Focusable Light Head
Ammonite LED Nautilus Focusable Light Head

Ammonite Nautilus Focusable Light Head

Sale price£675.00

The Ammonite Nautilus Focusable Light Head with up to 4000 lumens light output has an adjustable beam that can be focused from a narrow 9º to a wide 45º. Operational burn times range from 4 to 10 hours, depending on the battery.


Dispatched in 1 to 2 days

Contact Form & Details

How can we help?

If you need to contact us for any issue or assistance, you can do so online by filling out the online Contact Form, emailing us at or calling us on +44(0)1305 824 555. If it's about a purchase you've made for us please also include your order number.

Our brick-and-mortar store Underwater Explorers based on Portland, Dorset is staffed 7 days a week, including weekends and bank holidays. As it's an active store visited by divers from around the country and world regularly, if we can't make it to the phone for any reason please leave a message and we'll get back to you asap.

Any queries are usually answered the very same day and at most within 24 hours.


Why Portland?

We’re located on the Isle of Portland (in Dorset) because Portland has been one of the most popular scuba diving locations in the United Kingdom even before we set up operations here back in the year 2000.

On one side, we’re minutes away from the sheltered waters of Portland Marina and Harbour, while on the other, it’s just a brief walk to reach our famous scuba diving destination Chesil Cove and start of the 16-mile-long Chesil Beach.  

Portland’s location makes it ideal for scuba diving, freediving, snorkelling and other surface water sports activities. 

Check out how many wrecks we have around here by clicking on Scimitar Diving's Wreck & Dive Sites chart!

Alongside dive clubs, many instructors and dive schools travel here to train and offer scuba diving certification ranging from open water diver to mixed-gas tech diving or rebreather diving levels.

Whether you’re doing a boat dive from Portland Marina or Castletown or a shore dive at Chesil Cove, Portland is well known for offering many possibilities: Reef diving to wreck diving and night diving, underwater photography or underwater videography. Anything other than cave diving is possible here.

Likely being the best-stocked diving shop in the UK, at Underwater Explorers we offer in-store scuba diving equipment advice and sales, as well as gas fills, to locals and visitors (read About Us).

But... If you’re googling “scuba diving shop near me” like some, look no further, there's DirDirect online.

Here at DirDirect, we list our cutting-edge equipment for worldwide delivery and we’ve got you covered whatever your level of diving: We’re your local dive store wherever you are in the world.

All that with over 20 years of experience especially in technical diving, from training to equipment, advice and sales.


Underwater Explorers, Unit 1, Maritime Business Centre
Mereside, Portland, Dorset, DT5 1FD


The Ammonite Nautilus Focusable Light Head is Ammonite System's most versatile light head with up to 4000 lumens light output and an adjustable beam that can be focused from a narrow 9º to a wide 45º. Operational burn times range from 4 to 10 hours, depending on the battery used.

It has been built with the technical diver in mind for demanding conditions and is bright, durable, lightweight and reliable.

Ammonite Nautilus specifications

Ammonite System is modular

Due to the modular design concept, you can configure your umbilical light set regarding your needs.

All Ammonite umbilical lights, cables, batteries and heating batteries are equipped with the same chinch-type connector. So when one of the parts wears out, or you would want to upgrade it, there are no obstacles to doing so.

Modularity also affects the convenience of use and safety. For example, you can change the broken cable for a new one on the diving spot without sending it to the service centre.

Ammonite Nautilus Light Head burn times

Ammonite System Nautilus LED light head burn times vary depending on the battery you will be using and the power setting. The chart below is based on the 9, 10, 14 and 24Ah battery sets that can be purchased with the light head all-inclusive in the Ammonite Nautilus Focusable Light Kit.

Ammonite Nautilus burn times

Nautilus is one of a kind

As an experienced diver, you know perfectly how it is difficult to find a bright, durable, lightweight dive light that works reliably in almost every condition.

The Ammonite Nautilus light head utilises the latest Cree CXB LED chip with a Fresnel lens that allows you to make the most out of the impressive 4000-lumen output. You can smoothly adjust the light beam to be as narrow as 9º or as wide as 45º.

Three light levels

LED Nautilus features three light levels BOOST, OPERATIONAL and BACK-UP, to preserve battery and adjust brightness levels to eliminate backscatter in murky water. The burn time of the light will depend on what level one has chosen.

Durable and compact

The smooth and compact design of the Ammonite Nautilus light head is perfectly balanced, making it easy to operate when in use with or without a Goodman Handle.

All these features are packed in relatively small housing that’s only 140mm long and 60mm in diameter. Yet, while exceptionally durable, the Nautilus light head weighs 415g and 150g underwater.

The Ammonite Nautilus light head is built from marine-grade aluminium alloy covered with a hard anode making it resistant to corrosion and mechanical scratches.

The 6mm front glass is made of highly fatigue-resistant tempered glass. The Nautilus light head has been extensively tested in use and can safely go down to a depth of 150m.

Easy-to-operate switch knobs are made of lightweight but very tough and corrosion-resistant polymer (Delrin®).

Take me home mode

The inner microchip system signals a low battery level with a strobe flash. When the battery is drained, it automatically switches to take “Take me home” mode (light output at 20% light intensity).

"Take me home" is a backup mode to which Ammonite umbilical lights switch when the battery is drained. Light will continue operating for at least 1 hour or more depending on the light and used battery. Light will only work in "take me home" mode until the battery is recharged again.

DirDirect Price Match

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