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Southwold Lighthouse
Southwold -Suffolk -lighthouse -23Sept2007.jpg
The lighthouse in 2007
Location Southwold, Suffolk
Coordinates 52°19′38″N 01°40′53″E / 52.32722°N 1.68139°E / 52.32722; 1.68139Coordinates: 52°19′38″N 01°40′53″E / 52.32722°N 1.68139°E / 52.32722; 1.68139
Year first constructed 1890
Automated 1938
Construction brick tower
Tower shape cylindrical tower with balcony and lantern
Markings / pattern white tower and lantern
Height 31 metres (102 ft)
Focal height 37 metres (121 ft)
Original lens 1st order 920 mm focal length, catadioptric fixed lens
Current lens Pelangi PRL400TH
Intensity 17,100 candela
Range 24 nautical miles (44 km)
Characteristic White rotating – flashing once every 10 seconds
Admiralty number A2272
NGA number 1588
ARLHS number ENG 135

Southwold Lighthouse is a lighthouse operated by Trinity House in the centre of Southwold in Suffolk, England. It stands on the North Sea coast, acting as a warning light for shipping passing along the east coast and as a guide for vessels navigating to Southwold harbour.

The lighthouse, which is a prominent local landmark, was commissioned in 1890, and was automated and electrified in 1938. It survived a fire in its original oil-fired lamp just six days after commissioning and today operates a 180-watt main navigation lamp. This lamp has a range of 24 nautical miles (44 km; 28 mi).

History

Lighthouse blue sky
Southwold Lighthouse

Construction of the lighthouse began in 1887, led by Sir James Douglass, Engineer in Chief of Trinity House. A light was lit on a temporary structure in February 1889 and the lighthouse itself began operating on 3 September 1890. Previously, three fixed lights had been displayed from the cliff at Southwold; these were now discontinued. Both the lantern (the uppermost part of the structure) and the optic (a first-order fixed Fresnel lens), had originally been built by Chance Brothers in 1868 for Happisburgh Low Lighthouse; they became available for re-use when the latter light was demolished in 1883.

Lighthouse lens - geograph.org.uk - 514903
Lower half of the 1868 optic (pictured in 2007)

The light was initially powered by a six-wick Argand oil burner; it displayed a group occulting characteristic (the light being eclipsed twice every 20 seconds) and had a visible range of 17 nautical miles (31 km; 20 mi). The light was white, but shone red across defined sectors to the north and to the south (indicating the Barnard sands and Sizewell Bank respectively); in addition, 'spare' light, which would otherwise have shone needlessly westwards, was diverted by way of vertical condensing prisms so as to intensify these red sectors.

Just six days after the light was commissioned there was a fire in the lighthouse with the burner being destroyed. The inexperience of the new lighthouse keepers was blamed for the fire.

The burner was replaced with an oil-fired light in 1906 and a petroleum burner in 1923. The light was electrified and automated in 1938, at which time the light characteristic was changed to group flashing, 6 flashes every 20 seconds (modified to 4 flashes in 1965). It was converted to battery operation, with the batteries charged using mains electricity, in 2001. Until 2013 a cluster of three 90-watt Osram Halostar lamps provided the main light within the optic (which had a range of 17 nautical miles (31 km; 20 mi)).

The lighthouse, along with Lowestoft Lighthouse to the north, was threatened with closure by Trinity House in 2005, with shipping companies increasingly using satellite navigation systems rather than relying on lighthouses. Both lighthouses were reprieved in 2009 following a review by Trinity House that found that satellite navigation systems were not yet sufficiently reliable.

Lighthouse, Southwold 13-09-2014 (19369482922)
2014: Central and lower parts of the old optic retained for emergency use; above it, the new main lamp inside a small rotating optic.

Then in December 2012, the range of Southwold's light was increased to 24 nautical miles (44 km; 28 mi), to compensate for the imminent closure of Orfordness Lighthouse (which took place in June 2013). This was achieved by installing a new main light: a BLV Topspot 90 Volt Metal Halide 150-watt lamp placed within a small revolving optic. To make space for it within the lantern room the upper prismatic section of the old optic was removed (one section was put on display at the foot of the tower, another was loaned to Happisburgh Lighthouse where it has been put on display not far from its original location). The central and lower sections of the old lens, together with its lamp, have been retained for use as an emergency backup.

Current display

Southwold, Lighthouse (16216675698)
2014: Part of the upper section of the 1868 optic, removed and on display at the foot of the tower.

Since January 2016 a 180-watt revolving MFR (LED reflector) lamp manufactured by Mediterraneo Sanales Maritimas has been in use as the main lamp The current light characteristic is one white flash every 10 seconds (Fl(1).W.10s) visible between 204°–032.5°. The white light is used for general navigation. Red sectors, previously used to mark shoals to the north and offshore sandbanks at Sizewell to the south, were removed as part of the 2012 refit.

Buildings

Staircase in Southwold lighthouse - geograph.org.uk - 514893
Inside the tower

The lighthouse is 31 metres (102 ft) tall, standing 37 metres (121 ft) above sea level. It is built of brick and painted white, and has 113 steps around a spiral staircase. Two keeper's cottages were built next to the lighthouse rather than living quarters being made in the lighthouse itself.

The lighthouse is a Grade II listed building. Guided visits are run by the Southwold Millennium Foundation.

The Sole Bay Inn and Southwold lighthouse - geograph.org.uk - 1162939
Southwold Lighthouse

The lighthouse was the site of charity abseil events in 2009, 2011 and 2013. The events raised money for the Southwold lifeboat operated by the RNLI from Southwold harbour.

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