what is sodium vapour lamp?
474185
these are the street lights that have an orange light,an electric current is passed through a sodium bulb causing it to heat up and glow,= light
238552
When subject to electric discharge in a vacuum tube, neon glows reddish-orange.  While neon is used as a generic term for glowing signs, other gasses are used to create colors other than red-orange.\n\nNeon can also be used in fluorescent black lights but the black-light effect is caused by the clear (or frosted) glass of the fluorescent tube being replaced with a Wood's glass, a nickel oxide, cobalt oxide-doped glass that blocks all light waves except for the ultra-violet spectrum.
1104822
Picture a lamp close to a wall.  The lamp has a shade that is a cylinder, (shaped like a tin can with the top and bottom cut off).  The shade is parallel to the wall.  When the light is on, the shape of the light on the wall is a hyperbola.\n\nReally!
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There are a number of products on the market that will do what you want, and be certified and safe.\n\nMake sure you get a warm LED though: cool white LEDs produce a terrible colour of light.\n\nhttp://www.theledlight.com/120-VAC-LEDbulbs.html
90061
Health\nMoney\nA room full of magic lamps
106923
it's usually called tube lighting
932202
Edmunds Scientific\n--> http://scientificsonline.com/search.asp?t=ss&ss=strobe
363367
something really harsh like paint stripper would have an effect as its quie volatile. if you can pour a flammable liquid into the tube such as petrol etc this will light from a distance but be super careful
105461
Neon gas and Mercury vapor are excited by high voltage to emit light, producing the light spectrum for these elements.\n\nThink neon lights and mercury vapor lights.  Both use a high voltage electrical supply.
593750
I'm not able to give a _complete_ description...  But as far as I know, a Reuter lamp is just a laboratory light source, that uses an ordinary light bulb (along with some fancy optics) to produce a focused (or collimated) beam of light that can be used for the sort of experiments done in first year Physics lab courses.  Some have cooling fans to keep the lamp cool despite the heating from the light bulb.  Essentially, it's just a fancy flashlight on a stick.
935131
http://en.wikipedia.org/wiki/Sodium_hydroxide
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Sodium is the chemical element in the periodic table that has the symbol Na (Natrium in Latin) and atomic number 11. Sodium is a soft, waxy, silvery reactive metal belonging to the alkali metals that is abundant in natural compounds (especially halite). It is highly reactive, burns with a yellow flame, reacts violently with water and oxidizes in air, necessitating storage in an inert environment.\n\nLike the other alkali metals, sodium metal is a soft, light-weight, silvery white, reactive metal. Owing to its extreme reactivity, it occurs in nature only combined in compounds, never as a pure elemental metal. Sodium metal floats on water and reacts with it violently, releasing heat and flammable hydrogen gas, and forming a solution of the strong base sodium hydroxide.\n\nSodium ions are necessary for regulation of blood and body fluids, transmission of nerve impulses, heart activity, and certain metabolic functions. It is widely considered that most people in Western countries consume more than is needed, in the form of sodium chloride, or table salt, and that this can have a negative effect on health. See Edible salt.\n\nUnder extreme pressure, sodium departs from standard rules for changing to a liquid state. Most materials need more thermal energy to melt under pressure than they do at normal atmospheric pressure. This is because the molecules are packed closer together and have less room to move. At a pressure of 30 gigapascals (300,000 times sea level atmospheric pressure), the melting temperature of sodium begins to drop. At around 100 gigapascals, sodium will melt near room temperature.\n\nA possible explanation for the aberrant behavior of sodium is that this element has one free electron that is pushed closer to the other 10 electrons when placed under pressure, forcing interactions that are not normally present. While under pressure, solid sodium assumes several odd crystal structures suggesting that the liquid might have unusual properties such as superconduction or superfluidity. (Gregoryanz, et al., 2005)\n[edit]\n\nApplications\n\nSodium in its metallic form is an essential component in the making of esters and in the manufacture of organic compounds. This alkali metal is also a component of sodium chloride (NaCl) which is vital to life. Other uses:\n\n    * In certain alloys to improve their structure.\n    * In soap, in combination with fatty acids.\n    * To descale metal (make its surface smooth).\n    * To purify molten metals.\n    * In sodium vapor lamps, an efficient means of producing light from electricity.\n    * As a heat transfer fluid in some types of nuclear reactors and inside the hollow valves of high-performance internal combustion engines.\n\n[edit]\n\nHistory\n\nSodium (English, soda) has long been recognized in compounds, but was not isolated until 1807 by Sir Humphry Davy through the electrolysis of caustic soda. In medieval Europe a compound of sodium with the Latin name of sodanum was used as a headache remedy. Sodium's symbol, Na, comes from the neo-Latin name for a common sodium compound named natrium, which comes from the Greek nítron, a kind of natural salt. As early as 1860 Kirchhoff and Bunsen noted the sensitivity that a flame test for sodium could have. Stating in Annalen der Physik und der Chemie in the paper "Chemical Analysis by Observation of Spectra": "In a corner of our 60 cu.m. room farthest away from the apparatus, we exploded 3 mg. of sodium chlorate with milk sugar while observing the nonluminous flame before the slit. After a few minutes, the flame gradually turned yellow and showed a strong sodium line that disappeared only after 10 minutes. From the weight of the sodium salt and the volume of air in the room, we easily calculate that one part by weight of air could not contain more than 1/20 millionth weight of sodium."\n[edit]\n\nOccurrence and production\nThe flame test for sodium displays a brilliantly bright yellow emission due to the so cal
74731
The gas mixture within the latest halogen lamps is designet to interact with the tungsten that is vaporized from the burning filament so that it will not coat the interior of the lamp glass, which wpi;d otherwise dim the bulb, thus extending its lifetime.  It can also be used to affect the spectrum of  the emitted light, with differing gas mixtures altering the emission spectrum.
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The sodium vapor is absorbing the electromagnetic energy in that specific band.  It is actually two lines, close together, in the yellow-orange part of the visibile spectrum.\n\nThe energy of that yellow-orange light contains precisely the quanta of energy to excite electrons into higher energy states, so the sodium vapors abosrb very strongly at those frequencies.  The other frequencies are at the wrong energy level, and are "ignored".
180630
I am a certified electrican btw.  A ballast in a flourescent light fixture provides the right voltage supply to the flourescent light tube.  The ballast is basically a step up - or step down transformer, which means just an increase or decrease in voltage to the lighting tube.  The ballast also controlles the voltage/power from the actual power supply from the building, beacuse this power can fluxuate up and down, and/or have a very messy sign-wave.  The volage must stay in a certin small limit range for the light to work properly.  Ballast are getting better for the quaility of light they put ie, colour, less flicker.  And they are also now more power efficent - ballast with a T8 marking on them are the newer kind, old T5's can be very hot to the touch and could also contain PCB's with are harmfull to your health.  Contact an electrian if you find an old ballast that is leaking , that does not have the saying "PCB free, or doesnot contain PCB's.  LOL this is prolly more then you asked for but here it is anyway.  And if this isnt enough here is an intesnse explination of a ballast \nhttp://home.howstuffworks.com/framed.htm?parent=question337.htm&url=http://www.thekrib.com/Lights/fluor-tech.html
177665
Here you go...\n\nhttp://www.electronicsforu.com/EFYLinux/circuit/dec2003/CI-01-night-lamp.pdf
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The lamp consists of an illuminating bulb, and a glass bottle containing a transparent liquid, translucent wax, and a metallic wire coil. The glass bottle sits on top of the bulb, which heats its contents. The metallic wire coil is hidden in the base of the lamp, which the glass bottle is sitting on.\n\nThe wax is slightly denser than the liquid at room temperature, and slightly less dense than the liquid under marginally warmer conditions. This happens because the wax expands more than the liquid when heated.\n\nThe light bulb heats the container at the bottom, and due to heat exchange with the atmosphere, the container eventually dissipates the introduced heat. This method of heat transfer is called convection.\n\nWax at the bottom heats until it melts, and eventually becomes less dense than the liquid above it. At this time, a portion of the wax rises towards the top of the container. Near the top, away from the heat source, the wax cools, contracts, and as its density increases it begins to fall through the liquid towards the bottom of the container again. The difference in temperature between the top and bottom of the globe is only a few degrees.\n\nOne mass of wax may rise as another falls. The metal coil at the bottom helps to overcome the surface tension of the individual wax droplets, causing the descending blobs to agglomerate into a single molten wax mass at the bottom of the container. The cycle of rising and falling wax droplets continues so long as the bottom of the container remains warm and the top of the container remains cool. Operating temperatures of lava lamps vary, but are normally around 60 °C (140 °F). If too low or too high a wattage bulb is used in the base, the "lava" ceases to circulate, either remaining quiescent at the bottom (too cold) or all rising to the top (too hot).\n\nChaotic behaviour makes the movement of the wax unpredictable—hence lava lamps can aid in the generation of one-time pads for cryptographic use.\n\nThe colour of the wax and the liquid often varies and can be found in many different combinations.