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White Light

Halogen lamps were invented in the 1950s. A high-temperature, long-lasting tungsten filament was enclosed in quartz. The quartz enclosure was filled with halogen, producing a bright white light with a bluish tint. Halogen is extremely reactive, and the halogen cycle which leads to the production of this bright light works best in very high temperature. Halogen bulbs are much more efficient and long-lasting than ordinary incandescent bulbs.
There has been evolution in halogen lamps ever since. A small quartz bulb is filled with gas (inert gas like argon or premium gas like krypton or xenon) and of halogen. Since the gas is filled at very high pressure (to make it work efficiently) and operated at very high temperature, the envelop holding the chemically reactive gas should be both heat resistant and of high strength. Hence, quartz was the natural choice over glass. The atoms of the tungsten filament evaporate during the operation of the bulb. The particles condense and settle on the inner surface of the bulb.
Halogen, being a highly reactive gas, reacts with the condensed particles, converting them into tungsten halide. Tungsten halide evaporates easily, and when particles reach the heated filament (due to running electricity) they break to release the halides, and the tungsten particles settle back on the filament. Due to this process, the evaporated particles of the filament are returned and the process of thinning of filament is slowed down. Thus the bulbs are long-lasting in comparison to incandescent lamps. Due to this halogen cycle, the inner surface of the bulb is always clean, leading to bright light even in aging halogen lamps.
However, the halogen cycle is not a fool-proof solution, so even halogen bulbs do not last forever. The tungsten halides that return to the filament may not settle down in the spots from where evaporation had occurred. Thus, the problem of thinning filaments still exists to some extent. Apart from this, the life of a halogen bulb may be lowered due to notching or necking.
Halogen bulbs contain highly dangerous and reactive gaseous material, and so bursting halogen bulbs can be very dangerous. Halogen bulbs should not be touched with bare hand or tampered with in any way, and proper guidelines for installation and handling should be followed.
Light Bulbs provides detailed information on Light Bulb, Halogen Light Bulb, Fluorescent Light Bulb, History of the Light Bulb and more. Light Bulbs is affiliated with Light Fixtures.
how do i filter a white light into specific spectrum?
I'm trying to do a scientific project where i need to separate white light into different spectrums. I know I could use a prism to separate the light into a full spectrum, but for my experiment i need specific colors, for example just red and orange (instead of all 7 colors). any idea on how to do this?
A light filter is a glass or plastic of a particular color. It only allows one color to go through.
A red filter will allow only red light to go through.
Gorillaz-White Light
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Whirlpool PUR Side by Side Refrigerator Push Button Cyst Reducing Water Filter
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Presto 04820 PopLite hot air popper
$29.99 Plug in Prestos PopLite and the party begins. In less than 2.5 minutes you will have up to 18 cups which is equal to two large bowlfuls of fluffy popcorn with virtually no unpopped kernels. And because the machine uses hot air instead of oil the resulting snack is healthier and lower in calories. Thats not to say you can nott add butter in fact the half cup measuring cup on top of the popper doubl... |
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Cuisinart CPK-17 PerfecTemp 1.7-Liter Stainless Steel Cordless Electric Kettle
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Icky Thump
$7.23 Bagpipes, a song written as the soundtrack to a Michel Gondry music video, Patti Page's musical shadow, and Jack and Meg co-narrating a scavenger's rummages: It must be time for Icky Thump, the many-flavored riposte to 2006's Get Behind Me Satan. The duo starts big with the title track--Jack's fast-tumbling, falsetto-tinged lyrics jagging on hyper keyboard-sounding segues and Meg's pounding drums.... |
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Grace
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Shine a Light
$5.59 Martin Scorsese leaps into the madness of the Rolling Stones' organization in Shine a Light, barely controlling (in a most entertaining way) a documentary that culminates in the Stones' best concert on film. The movie's highly entertaining, pre-performance prologue finds a frazzled Scorsese trying to get a clue about the band's plans for a very special New York City date in 2006, a benefit hosted ... |
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Titanic [VHS]
$4.23 When the theatrical release of James Cameron's Titanic was delayed from July to December of 1997, media pundits speculated that Cameron's $200 million disaster epic would cause the director's downfall, signal the end of the blockbuster era, and sink Paramount Studios as quickly as the ill-fated luxury liner had sunk on that fateful night of April 14, 1912. Some studio executives were confident, ot... |
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Star Wars Trilogy (Special Edition) [VHS]
$8.01 The Star Wars trilogy had the rare distinction of becoming more than just a series of movies, but a cultural phenomenon, a life-defining event for its generation. On its surface, George Lucas's original 1977 film is a rollicking and humorous space fantasy that owes debts to more influences than one can count on two hands, but filmgoers became entranced by its basic struggle of good vs. evil "a lon... |
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Laura [VHS]
$1.49 This silky smooth film noir pits gruff police detective Dana Andrews, stiff and blunt in his street-bred manners, against a cultured columnist and acidic wit (Clifton Webb at his prissiest) in a battle of wits during a murder investigation. The cop is a romantic hiding under a hard-boiled exterior who falls in love with the beautiful victim through the portrait that hangs in her apartment. Gene Ti... |
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Sleeping Beauty (Two-Disc Platinum Edition)
$18.74 Disney's 1959 animated effort was the studio's most ambitious to date, a widescreen spectacle boasting a gorgeous waltz-filled score adapting Tchaikovsky. In the 14th century, the malevolent Maleficent (not dissimilar to the wicked Queen in Disney's Snow White and the Seven Dwarfs taunts a king that his infant Aurora will fatally prick her finger on a spinning wheel before sundown on her 16th birt... |
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