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The Penedo da Saudade lighthouse started operations on February 15, 1912. At that time it was equipped with a rotating 3rd–order optical device with a 500mm focal length and the light was fuelled by oil vapour. [2] [3] From March 1916 to December 1919 the light was extinguished due to World War I.
Light fixtures may also have other features, such as reflectors for directing the light, an aperture (with or without a lens), an outer shell or housing for lamp alignment and protection, an electrical ballast or power supply, and a shade to diffuse the light or direct it towards a workspace (e.g., a desk lamp).
A trouble light using a compact fluorescent lamp. From top to bottom are a hook, a cage, the switch and a handle in one molding. A trouble light, also known as a rough service light, drop light, or inspection lamp, is a special lamp used to illuminate obscure places and able to handle moderate abuse.
It was painted white with two red bands near the top. The base of the tower has an altitude of 61 metres and the tower is 31 metres tall. The light is a yellow Isophase light emitting 3-second flashes every six seconds, with a range of 22 nautical miles. It is technically known as the Azeda/Setúbal Entrance Range Rear Light. [1] [2] [5]
Vertical light rays of the lamp are redirected into a horizontal plane, and horizontally the light is focused into one or a few directions at a time, with the light beam swept around. As a result, in addition to seeing the side of the light beam, the light is directly visible from greater distances, and with an identifying light characteristic.
It is important to allow maximum ventilation, especially in the summer months, to eliminate interior condensation. This ventilation can be achieved through a mounted passive louver system. A protective coating of either paint, stucco, or lime-mortar-wash is typically applied to concrete lighthouses as a layer of defense from external elements. [4]