LED Light Source installed at Emery Point Lighthouse

Sealite Case Studies

LED Light Source installed at Emery Point Lighthouse

LED Light Source installed at Emery Point Lighthouse

By:Sealite | May 24, 2016
Application: Replace traditional light source in 4th Order drum lens
Products: LED Light Source
Location: Northern Territory, Australia
Site: Emery Point Lighthouse, Darwin GP3 (1.0) every 15 sec WR

Emery Point is an active Lighthouse, established in 1915 – Built during the “Golden Age of Australian Lighthouses”. The structure is a robust square metal skeletal tower and was the only navigational aid to remain functional in the path of the Cyclone Tracy when it hit Darwin in 1974. The traditional lantern house was equipped with a 4th order prismatic drum lens fitted with a red sector, which was originally powered by acetylene gas and then converted to a 120 volt 1000 Watt electric lamp changer.


The tungsten-halogen light source comprised of two 1,000W lamps mounted on a mechanical lamp changer that required regular maintenance. The flash character electronics had become unreliable, and a larger battery bank was needed as a back up to the mains power. Existing customer, Darwin Port Corporation chose Sealite’s LED Light Source as it is the most optically efficient method of lighting a 4th Order lens. The light source would retain the traditional historical value, provide a reliable high luminous efficiency, single back up battery and require less maintenance and significantly lower installation costs. This ensured a major cost saving to the Port.

LED benefits

The LED Light Source uses 6 surface-emitting LEDs with an overall power level of 40W. To provide additional optical standby coverage two controllers were provided driving LED numbers 1, 3 and 5 in the diagram from controller 1 and LED’s 2, 4 and 6 from controller 2. Due to the layout of the LED’s should one LED fail the light from the adjacent LED’s will offer standby light at reduced range. Surface emitting LEDs used in the LED Light Source are around eight times more efficient than the previously installed tungsten filament lamp. Four or six of these devices are mounted on a heat sink to provide an omnidirectional light output and to keep the LEDs cool.

Expected Lifetime

Filament lamps have an expected life of about 2000 hours at best but on average 500 hours. Since the expected lifetime of the LED is around 10 years, there is no longer a need to provide a lamp changer with moving parts, reducing the need of service visits.


The design originated from a manufacturing agreement with Trinity House to produce a LED light source, developed by the General Lighthouse Authorities Research and Radionavigation Directorate. The light source is designed for modernisation of large lighthouse prismatic lenses, increasing their efficiency and reducing maintenance.

The innovative Sealite LED Light Source delivers long life, high luminous efficiency and reduced energy and maintenance costs – It offers a simple and economical solution for conversion of most stationary or rotating lighthouse optics.

Darwin Port Corporation recently welcomed the installation of Sealite LED technology to the historic Emery Point Lighthouse. Praising its impressive functionality, Marine Pilot, Captain Alistair Logan, said that,

the Sealite LED light has an impressive clarity and range. It was able to be installed without disruption to the historic structure, maintaining the integrity and antique character of the original glass lens.


  • 1000W lamp replaced with 40W LED
  • Long life LEDs are used. Therefore, a moving lamp changer is no longer required
  • High luminous efficiency generates huge savings in energy and maintenance
  • Suitable for use in both revolving and fixed optics
  • Capable of continuous or flashing operation
  • Retains the historical heritage of the lighthouse
  • 4% of the original load makes solar power viable

What Our Client's Say

On behalf of Karachi Port I am pleased to acknowledge your good service and provision of the new SL-75 solar marine lanterns installed by your firm in the harbour channel at Karachi Port. The new lanterns are very feasible and useful and equipped with the latest navigational technology.

-Captain Muhammad Altaf

[Re: Sealite SL-LED Lightsource at LaCorbiere Lighthouse], We were impressed with Sealite’s solution which provided a modern, reliable and efficient light source whilst remaining sympathetic to the lighthouse’s heritage and significance as a local landmark, but most importantly to improve upon reliability and to continue its vital role in aiding the safety of navigation in Jersey’s waters, as it has done for nearly 130 years.

-Aaron Gavey

[Re: Sealite Wins Duke’s Choice Award for Java Technology & the Environment – Sealite GSM monitoring & control system]. The team at Motorola were extremely impressed with Sealite’s innovative integration of the G24-Java wireless module in their GSM Monitoring & Alarm System.

-Golan Haver

As one of your new distributors (Belize and Honduras, Waller Marine Belize LTD), I would like to express my congratulations to you and your people in providing reliable, dependable and inexpensive products. Formerly we were distributors for a Canadian made product but these were found to be too expensive for the market and also offered only difficult and complicated programming. Our first order of lights from you (SL15’s) took only four days to arrive from Aussie Land, when I opened the box they were still flashing. I tested a SL60 (white) for four days (steady on) before it required a recharge…remarkable. I will be placing another order shortly. Keep up the good work.

-Capt Andy Suddes

[Re: Installation of WindTalker for kite-surfing club], The WindTalker™ is a big success here in Cyprus, thanks to your after sales support the unit is now functioning perfectly.

-Christophe Meletiou

We choose to sell Sealite … this is a long story, well we treat Sealite as our own and the relationship we have developed with Jeff and Chris and their attitude and commitment towards growing Sealite to this stage is remarkable. We feel at home when talking to them and the staff of Sealite and this in turn gives us more security and strength in selling products in India.

-Aliasgar E Patrawala

[Re: Sealite Solar-Powered LED Area Lighting system], We chose the Sealite system for the Jacobs Well Queuing Pontoon due to our previous experience with Sealite’s product, its durability and construction.

-Peter Taylor

I just wanted to say thank you for the light and bracket Sealite supplied to Birkenhead Marina. As the other lights (old ones) need new batteries I will be replacing them with new lights from Sealite and the same brackets that you supplied with the light we received last week … Your product is excellent and the system of setting the light is good also. Thanks again for all your trouble.

-Philip McGowen