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The most common type of floodlight was the metal-halide lamp, which emits a bright white light (typically 75–100 lumens/Watt). Sodium-vapor lamps are also commonly used for sporting events, as they have a very high lumen to watt ratio (typically 80–140 lumens/Watt), making them a cost-effective choice when certain lux levels must be provided. [4]
As a result, metal-halide lamps have high luminous efficacy of around 75–100 lumens per watt, [2] which is about twice that of mercury vapor lights and 3 to 5 times that of incandescent lights [1] and produce an intense white light. Lamp life is 6,000 to 15,000 hours.
Announced in 2011 China has banned imports and sales of certain incandescent light bulbs since October 2012 to encourage the use of alternative lighting sources such as light-emitting diodes (LEDs), with a 5-year plan of phasing-out incandescent light bulbs over 100 watts starting 1 October 2012, and gradually extend the ban to those over 15 ...
It was built in the early 19th century to help guide shipping into the newly constructed harbour, which acted as the terminus for the packet service between Ireland and England. In 1982 it was decommissioned and replaced by a modern pole light on an adjacent extension of the pier. [1] [2] Old Howth Harbour Lighthouse lit at night
An illustration of the Dublin whiskey fire in The Illustrated London News, 1875. The Dublin whiskey fire took place on 18 June 1875 in the Liberties area of Dublin. [1] It lasted a single night but killed 13 people (from alcohol poisoning), and resulted in €6 million worth of damage in whiskey alone (adjusted for inflation). [2]
A typical 100 watt tungsten filament incandescent lamp may convert only 5% of its power input to visible white light (400–700 nm wavelength), whereas typical fluorescent lamps convert about 22% of the power input to visible white light.