Sealite Marine Lanterns Modernise Sark Lighthouse

Sealite Case Studies

Sealite Marine Lanterns Modernise Sark Lighthouse

Sealite Marine Lanterns Modernise Sark Lighthouse

By:Sealite | July 18, 2018
Application: Sealite Marine Lanterns Modernise Sark Lighthouse
Products: Two SL-300 (13-21NM) LED Marine Lanterns
Location: Channel Islands (Sark Island, off France's Northwest Coast)
Date: February 2018

“The lighthouse is fully operational at present. We expect the light station to get a further 20 years of reliable operation, enhancing safety for mariners in the area.”

– Trinity House Programme Manager, Steve Keddie


The Channel Island archipelago is situated off the northwest coast of France and consists of four main islands, interspersed with eight small, uninhabitable islands in the English Channel. The island chain is surrounded by islets and rocks which litter the dangerous-but-navigable waterways. Currents of up to 12 knots, combined with frequent poor visibility and foul weather, make navigation in the Channel Islands a challenge.

Sark, one of the smaller inhabited islands, covers approximately 2 square miles/5.4km. It is connected to other islands in the archipelago by ferry and is car-free; tractors and horse-drawn carriages are the only permissible vehicles. Sark enjoys the distinction of being designated as a Dark Sky Community, adopting ordinances to help alleviate wildlife sensitivity to artificial light at night. With its rugged natural beauty and steep rocky coastline, Sark is a natural attraction for tourists and sailors alike.

The first lighthouse (Sark) on the tiny island was constructed in 1913 by Trinity House. Its stone construction ensured it would weather the rough, Channel Island environment. Made entirely of stone and poised on top of the Blanchard Rock pinnacle, it aids vessels as they navigate through the treacherous waterways of the Channel Islands.


Access to Sark Lighthouse is extremely challenging, with access being only via a flight of steps from the top of the cliff. The lighthouse is attached to the steep face of the cliff which rises high above it, while the steep rocky nature of the coastline lies below. Due to the challenging and dangerous terrain, maintenance of the lighthouse proved difficult and time-consuming.

Though automated in 1994, Sark lighthouse required an extensive amount of power to turn the two-ton rotating optic, making it extremely inefficient to operate. Additionally, the light rotated on a hazardous mercury bath, posing a potential health risk to lighthouse staff. Frequent repairs and new navigational requirements established the need to upgrade the lighthouse station system and modernize the optic.


Two Sealite SL-300 LED marine lanterns were selected by Trinity House (a UK based charity which acts as a General Lighthouse Authority) to replace the old rotating optic. The two LED lanterns are positioned one above the other to provide the main light and a standby light arrangement, whilst both achieving the navigational requirements. With a range of up to 21NM, the SL-300 long-range lanterns can be adjusted to over 90,000cd per lantern, providing a high intensity, two-tier light source for the Sark lighthouse. A decrease in required maintenance, along with the high efficiency of the new lanterns provided, huge cost savings were seen by Trinity House.

The unique LED design and size of the lights present significant advantages over larger assemblies and enable the efficient running of the lighthouse, whilst maintaining the effective range for the safety of mariners. The full re-engineering of the lighthouse saw the electronics upgraded along with the light source for a full lighthouse solution. The re-engineered Sark lighthouse is now more economical and achieves reliable operation for Trinity House and will for many years.

What Our Client's Say

[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 with Dana 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