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A fluorescent lamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor, to produce ultraviolet and make a phosphor coating in the lamp glow.
Original 4–13 W miniature fluorescent range from 1950s or earlier. [1] Two newer ranges, high-efficiency (HE) 14–35 W, and high-output (HO) 24–80 W, introduced in the 1990s. [2] Panasonic's range of FHL fluorescent tubes in 18W, 27W, and 36W varieties for the Japanese market. Circular fluorescent tubes.
The Platts assessment process determines the value of physical commodities 15–30 days forward for many oil products loading in Singapore. [1]MOPS is an acronym that stands for the Mean of Platts Singapore, and typically refers to any contract mechanism that derives its value by referencing the average of a set of Singapore-based oil price assessments published by Platts.
A CFL has a higher purchase price than an incandescent lamp, but can save over five times its purchase price in electricity costs over the lamp's lifetime. [1] Like all fluorescent lamps, CFLs contain toxic mercury, [2] which complicates their disposal. In many countries, governments have banned the disposal of CFLs together with regular garbage.
The use of whale oil declined after Abraham Gesner, a Canadian geologist, first refined kerosene in the 1840s, allowing brighter light to be produced at substantially lower cost. [4] In the 1850s, the price of whale oil dramatically increased (more than doubling from 1848 to 1856) due to shortages of available whales, hastening whale oil's ...
SINGAPORE (Reuters) -Two large oil tankers were on fire on Friday after colliding in waters near Singapore, the world's biggest refuelling port, with two crew members airlifted to hospital and ...
Fire requires three elements to burn: fuel, oxidant and heat; the triangle of fire. Remove one element of this triangle and the burning will stop. A safety lamp has to ensure that the triangle of fire is maintained inside the lamp, but cannot pass to the outside.
Such bulbs, may differ from standard types by only the number of filament supports and while labelled for special uses they are widely available in markets and hardware stores at much lower cost than official alternatives such as CFLs. [64] After bans were first introduced prices of these bulbs rose by 20–25%. [65]