The SL70 is a solar marine lantern used as an aid to navigation. It is an Australian innovation which enhances safety at sea by providing a reliable marine aid to navigation through the marking of hazards, or general navigation. The extremely low current requirements of the LEDs, and the solar-battery integration, allow the unit to operate with no human intervention for approximately 5 years.
The lantern received an Australian Design Award and Powerhouse Museum Selection award in 2003. The principal technical significance of the SL70 is that the LED reflector increases the 360 degree horizontal uniformity of the light output and allows the unit to achieve a range of 3.2 kilometres.
The solar modules are angled to maximise solar energy capture. The sealed battery compartment is isolated from the main internal compartment and is impervious to water. The SL70 can operate without sunlight for twenty days.
The LED reflector has patent applications in the United States, Canada, United Kingdom and Australia and has been exported to 15 countries.