The Nautilite ReefMaster 1800 is a powerful and rugged underwater torch designed for divers who demand strong output, long burn times and dependable construction. Delivering up to 1800 lumens through a focused narrow beam, it’s ideal for night dives, low-visibility conditions and general underwater exploration.

The ReefMaster 1800 is an excellent choice for recreational divers looking for a high-output, easy-to-use torch with strong build quality and long runtimes — whether used as a primary night-diving light or a powerful backup.

Light Output & Modes

• White Light: 1800 lumens (High), 1000 lumens (Low)

• Burn Time: up to 4 hours (High), up to 6 hours (Low)

• Modes: White light and emergency SOS

• Beam Angle: 9° narrow beam for excellent penetration

Build & Operation

• Push-button operation with simple power cycling

• Clean, streamlined body with no exposed charging ports during use

Durability & Materials 

• Machined from 6061-T6 aircraft-grade aluminium alloy

• Durable glass lens for repeated underwater use

• Black hard-anodised coating for corrosion resistance

• Waterproof to 100 metres / 328 ft (IPX-8 rated)

Battery, Size & Weight

• Battery: 1 × 26650 Li-ion rechargeable battery

• Torch Dimensions: Ø 39 mm × 166 mm

• Weight: 340 g

Battery & Charging Indicators

• Battery level indicator:

  • Green: 100% – 75%

  • Yellow: 75% – 50%

  • Red: 50% – 25%

  • Flashing Red: 25% – 0%

• Charging indicator: Red = charging, Green = fully charged

What's in the box

• Nautilite ReefMaster 1800 Underwater Torch

• 26650 Lithium-Ion Battery

• USB-C Charging Cable

• Lanyard

• Spare O-ring

• User manual