Mercury vapor lamp

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Topic: Mercury vapor lamp

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	Mercury-vapor lamp - Wikipedia, the free encyclopedia
		Mercury vapor lamps (and their relatives) are often used because they are relatively efficient while still offering better color rendition than either high- or low-pressure pressure sodium vapor lamps.
		When the lamp is first turned on, mercury-vapor lamps will produce a dark blue glow because only a small amount of the mercury is ionized and the gas pressure in the arc tube is very low (so much of the light is produced in the ultraviolet mercury bands).
		The mercury vapor lamp is a negative resistance device and requires auxiliary electronics to prevent it from destroying itself.
	en.wikipedia.org /wiki/Mercury-vapor_lamp (861 words)

	46799.990916&ELEMENT_SET=DECL
		A further embodiment of the low-pressure mercury vapor discharge lamp according to the invention is characterized in that the material of the layer on the screen comprises at least an oxide of at least one element from the series formed by magnesium, aluminum, titanium, zirconium, yttrium, and the rare earths.
		A low-pressure mercury vapor discharge lamp as claimed in claim 4, characterized in that the layer (16a; 16b) on the screen (15a; 15b) comprises at least an oxide of at least one element from the series formed by magnesium, aluminum, titanium, zirconium, yttrium, and the rare earths.
		A low-pressure mercury vapor discharge lamp as claimed in claim 1 or 2, characterized in that the shielding means comprise a screen (15a; 15b) which is provided with a UV-repelling coating or layer (16a; 16b) at least at a surface which faces the discharge space (13).
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=99/46799.990916&ELEMENT_SET=DECL (2156 words)

	The High Pressure Mercury Vapor Lamp
		The Mercury vapor lamp has evolved considerably, with newer lamps containing additional ingredients in their discharge tubes, to improve the emitted light.
		When the lamp is properly wired, the existing voltage initiates an Argon glow discharge between the main and the auxiliary electrode pair(s), causing a sufficient number of Mercury atoms to be ionized.
		Although the intensity of all the visible Mercury lines in the arc is such as to make the lamp's light appear green/bluish white, the lamp's spectrum is severely lacking in red emissions.
	ioannis.virtualcomposer2000.com /spectroscope/mercurylamp.html (1266 words)

	15203.010301&ELEMENT_SET=DECL
		A low-pressure mercury-vapor discharge lamp as claimed in claim 1 or 2, characterized in that the electrode shield (22a; 22b; 122a) is tubular in shape.
		An alternative embodiment of the low-pressure mercury-vapor discharge lamp in accordance with the invention is characterized in that the current supply conductors are flattened, at the location of the mounted electrode shield, in a plane parallel to the electrodes.
		A preferred embodiment of the low-pressure mercury-vapor discharge lamp in accordance with the invention is characterized in that the electrode shield is clamped to the current supply conductors.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/15203.010301&ELEMENT_SET=DECL (3735 words)

	Mercury Vapor Lamp Life
		Rated life of Mercury Vapor lamps is based on survival of at least 50% of the lamps tested and allows for individual lamps, or groups of lamps, to vary considerably from the average.
		The normal mode of failure of a Mercury Vapor lamp is significantly reduced light output due to lumen depreciation or inability to light.
		Mercury Vapor lamps are affected less than other HID sources by a reduction in operating hours per start.
	tristate.apogee.net /lite/lhimvll.asp (149 words)

	NJDEP-Radiation Protection Programs
		The mercury vapor lamp is of the non-extinguishing type provided it is installed within a totally enclosed lighting fixture with a protective shield which protects the lamp from damage and absorbs shortwave ultraviolet radiation.
		"Mercury vapor lamp" means any mercury vapor or metal halide lamp incorporating a high-pressure arc discharge tube that has a fill consisting primarily of mercury and that is contained within an outer envelope (it does not include the tungsten filament self-ballasted mercury vapor or metal halide lamp).
		"Non-self-extinguishing mercury vapor lamp" means a mercury vapor lamp which does not comply with the requirements for a self-extinguishing mercury vapor lamp, hereinafter defined.
	www.state.nj.us /dep/rpp/nrs/nrsregs.htm (2663 words)

	High Pressure Discharge Sources
		The steepness of the curve suggests why mercury vapor is the only lamp that is listed with a rated and a usable life: long before we reach rated life (when half the lamps have failed) the remaining lamps are putting out such a small fraction of their rated lumens as to render them unusable.
		Metal halide lamps are similar in construction to mercury vapor lamps in that the light producing element is an arc tube which contains two operating electrodes and a starting electrode.
		All mercury vapor lamps manufactured after 1982, require a "disconnect mechanism" to disable the arc tube if the outer enclosure is broken to prevent dangerous UV exposure.
	plutarco.disca.upv.es /~jcperez/doctorado/SV2D3DPI/energy.arce.ukans.edu/book/sources/high.htm (4055 words)

	Low-pressure mercury vapor discharge lamp - Patent 4370595
		Low-pressure mercury vapor discharge lamp suitable for use in photo-therapy and having a glass discharge tube which is opaque to shorter wavelength ultraviolet radiation and bears a luminescent layer on its inside surface.
		The invention relates to a low-pressure mercury vapor discharge lamp for radiation purposes having a discharge tube made of glass having an absorption edge between 280 and 305 nm, the tube being coated on the inside with a luminescent layer.
		When the lamps according to the invention are used, it is therefore possible, in order to obtain the same quantity of useful radiation as that emitted by one of the said known lamps, to reduce the radiation time by more than 40%, while the erythema dose is reduced by approximately the same percentage.
	www.freepatentsonline.com /4370595.html (1984 words)

	BTH 400 watt MA/V Lamp
		Mercury vapor lamps with 400 watt quartz arc tubes (the lower wattage quartz lamps came out earlier, however) were introduced in 1948, and eventually became the standard in the 1950s.
		Although the basic technology for mercury vapor was first invented as a low pressure tube (called the Cooper-Hewitt tube) back in 1901, commerically available mercury lamps using medium to high pressure arc tubes did not come out until 1933, and were developed by GE in the USA and BTH in England.
		It is a tubular 400 watt mercury vapor lamp with a large, medium pressure arc tube.
	www.angelfire.com /stars4/streetlights/bth400w.htm (478 words)

	Fluorescent and HID Lamps
		Mercury vapor, metal halide and high pressure sodium lamps are HID lamps.
		Mercury vapor from a broken tube escapes to contaminate anyone nearby and the immediate area.
		High intensity discharge lamps (HID) lamps should be managed as dangerous waste because they are known to contain regulated amounts of lead as well as mercury in the base of the lamps.
	www.ecy.wa.gov /programs/hwtr/demodebris/pages2/demolights.html (620 words)

	UV Lamp Ballasts From Hill Technical Sales
		Ballasts provide an instantaneous high voltage to strike the elements within a mercury vapor lamp, creating a plasma that, once initiated, is sustained by the ballast.
		Constant wattage is accomplished by a resonant tank circuit in which the lamp winding is in a controlled magnetic saturation with AC capacitors, such that voltage swings on the input side have a very small impact on lamp current.
		Lamp current is sensed in a closed feedback loop circuit which can instantaneously respond to changes making the necessary adjustments.
	www.hilltech.com /ballstmn.html (466 words)

	GE Bonus Line Lamp
		Mercury lamps had poor lumen maintenance due to heavy blackening on the arc tube ends, caused by evaporation of the electrode emission material.
		Mercury vapor lamps were the cutting edge in lighting technology in the 1950s.
		Mercury lamps were twice as efficent as the incandescents they replaced, and also lasted much longer.
	www.angelfire.com /stars4/streetlights/ge400wmerc.htm (317 words)

	Lighting Source
		The metal halide lamp is similar to the mercury vapor lamp, the major difference being that the metal halide lamp contains various metal halide additives in addition to mercury vapor.
		Sodium vapor lamps are used on some highways, as are color-corrected mercury-vapor discharge lamps.
		The first lamp was a dish of stone (later of clay, pottery, or metal) containing vegetable or animal oil and a wick.
	www.movietheaters.com /lighting/index.htm (1836 words)

	Mercury Vapor
		A Mercury Vapor lamp consists of a clear quartz arc tube enclosed in a gas-filled hard glass outer bulb which, in turn, may be clear or phosphor-coated.
		The arc tube contains a small amount of mercury, together with argon gas, which is used to facilitate starting of the lamp.
		The arc tube structure features a one-piece, full-press construction that is designed to withstand thermal stress and internal pressures that occur during lamp operation.
	www.calpoly.edu /~cm/studpage/dwaters/light/mercuryvapor.htm (162 words)

	UVEXS - ECU Product Information
		Each medium pressure mercury vapor lamp is maintained in a thermally stable environment by a controlled, forced air cooling system.
		Should an additional lamp be required in the field the Model ECU will accommodate a retrofit addition.
		UVEXS lamps are warranted to operate for a minimum of 1000 hours.
	www.uvexs.com /products/ecu.html (404 words)

	The Typical Mercury Vapor Yard Light - darksky.org
		Another factor with mercury lamps is the lumen depreciation of the lamp.
		A mercury lamp never really burns out, it just gets fainter and fainter, using the same amount of energy to produce less light.
		A typical 175 watt mercury vapor yard light.
	www.darksky.org /key/keymerc.html (1006 words)

	FDA > CDRH > CFR Title 21 Database Search
		The provisions of this section apply to any high-intensity mercury vapor discharge lamp that is designed, intended, or promoted for illumination purposes and is manufactured or assembled after March 7, 1980, except as described in paragraph (d)(1)(ii) of this section.
		(7) Self-extinguishing lamp means a high-intensity mercury vapor discharge lamp that is intended to comply with the requirements of paragraph (d)(1) of this section as applicable.
		Each self-extinguishing lamp shall be clearly marked with the letter "T" on the outer envelope and on another part of the lamp in such a manner that it is visible after the outer envelope of the lamp is broken or removed.
	www.accessdata.fda.gov /scripts/cdrh/cfdocs/cfCFR/CFRSearch.cfm?FR=1040.30 (1032 words)

	Voltage of a Mercury Light
		A mercury vapor lamp is gaseous lamp that consists of two bulbs, one within the other.
		As the current continues to increase to its full potential, a ballast, which can be found in a mercury vapor lamp, serves as a resistor.
		Mercury lamps need a certain voltage to start up the arcs, which have an electrode on each end.
	hypertextbook.com /facts/2005/DorothySoo.shtml (371 words)

	mercury vapor lamp
		Most indoor mercury vapor lamps in arenas and gymnasiums have been replaced by metal halide lamps.
		However, like high-pressure sodium lamps, mercury vapor lamps have longer lifetimes (16,000—24,000 hours) than metal halide lamps.
		Mercury vapor lamps provide about 50 lumens per watt.
	www.daviddarling.info /encyclopedia/M/AE_mercury_vapor_lamp.html (181 words)

	Ulta Violet Mercury Quartz Lamp
		Its high-intensily Mercury Vapor Lamp emits both UVA and UVB and so may be used, under a physician's direction, for both types of phototherapy.
		This Lamp comes with or without a heavy-duty tripod which permits three-way adjustment: (a) the height of the Lamp, (b) the angle of the arm holding the Lamp and (c) the angle of the Lamp itself.
		The headband and nose piece are adjustable for patient comfort and the lenses are of sufficient transparency to permit the adjustment of the Lamp while the Eyewear is worn, to enhance patient safely.
	www.baar.com /uvlamp.htm (406 words)

	Redtailboa.net - News - How to dispose of a Mercury vapor lamp (and other fun stuff)
		number of mercury based lamps one can dump at a time.
		mercury bearing lamps instead of the rubbish I read.
		The mercury in the MV bulbs is incased in the Quartz arc tube.
	www.redtailboa.net /modules.php?name=News&file=showarticle&threadid=15465 (800 words)

	Mercury Vapor Lamp and High Voltage
		There is not oxygen or other oxidant in those lamps, so the mercury vapor couldn't ignite in the usual sense of the term.
		At 77 K mercury is a solid, with essentially zero vapor pressure so you could not observe a gaseous discharge that you would get under normal operating temperatures.
		Prior to applying the voltage, I decreased the temperature of the bulb with liquid nitrogen in hopes of keeping the mercury vapor cool from producing an illumination.
	www.newton.dep.anl.gov /askasci/gen99/gen99963.htm (384 words)

	Florida's Waste Management - Mercury-Containing Lamps & Devices
		MCLs include primarily fluorescent lamps of all types, high intensity discharge (HID) lamps (e.g., metal halide, mercury vapor and high pressure sodium), and some neon lights.
		High intensity discharge (HID) lamps: (from left) metal halide lamp; arc tube from mercury vapor lamp (outer glass globe removed); mercury vapor lamp.
		The term lamp includes, but is not limited to, fluorescent lamps, mercury lamps, metal halide lamps, and high pressure sodium lamps.
	www.p2pays.org /ref/15/14601.htm (364 words)

	Lamps i : Mercury Vapor Lamps
		Lamps i excludes all liability of any kind (including negligence) in respect of any third party information or other material made available on, or which can be accessed using, this Website.
		Mercury, an element that comes from both human-made and natural...
		Lighting fixtures, gu10 halogen, light bulb, lamp, fluorescent...
	www.lamps-i.com /mercuryvaporlamps/index.php (649 words)

	JoelMV.html
		The connections are simple; both neutral (white) wires, one from the generator and one to the lamp socket, are attached to one end of the coil; the incoming hot (black) wire goes to the center tap; and the hot (black) wire to the lamp socket goes on the other end of the coil.
		Once the merc lamp is up to it's full operating temperature (usually about 5 minutes after you turn it on) the voltage going to the lamp is right around 150VAC for a 175W lamp.
		A small hole is all that's needed.Two holes are needed for the wiring, one from the generator and one to the lamp socket.
	nitro.biosci.arizona.edu /zEEB/butterflies/JoelMV.html (1231 words)

	Mercury Vapor Heat & UV Lamps
		Mercury vapor lamps used for other applications have glass that does not permit the passage of much UV, making them useless in terms of using them in applications where UV is desired.
		I would also suggest that anyone using any mercury vapor lamp product in their home or workplace read the safety tips in the excerpt from the article by the FDA; it is in the Mercury Vapor Lamp article at my site.
		What I have found is data on the hazards of mercury vapor lamps and UVR (ultraviolet radiation) in general.
	www.anapsid.org /mercuryvapor.html (5086 words)

	UM Physics Demonstration
		To use the mercury vapor lamp, set the movable baffle over the small opening in the lamp housing so that it forms a small slit.
		Now, using the reflection grating mounted in a black holder with a lens in front of it, mount the grating on a bench rod in front of the lamp and adjust the position of the grating to focus the lines on the screen.
		Start the lamp by "tickling" it with the hand held Tesla coil and aim the beam away from the screen.
	www.physics.lsa.umich.edu /demolab/demo.asp?id=577 (222 words)

	Self-Ballasted Mercury Vapor Lamp
		Mercury Vapor lamps have a consistent color rendering and high light output and long life.
	www.nrgsaver.com /mall/self-ballasted-mercury-vapor.asp (77 words)

	Feature Article
		The element mercury (Hg) is largely responsible for generation of ultraviolet radiation spikes in almost all 'aquarium' lamps (including fluorescent, mercury vapor and metal halide lamps).
		Figure 1: Ultraviolet radiation generated by a mercury vapor lamp is selectively transmitted by a filter that absorbs most visible light energy.
		Notice that the lamp geometry (probably the 'dimple' in the end of the lamp) combined with the characteristics of the luminaire create an irregular (and generally unpredictable) UVR distribution pattern.
	www.advancedaquarist.com /issues/aug2004/feature.htm (4393 words)

	Save on a UV Active Heat Mercury Vapor Lamp
		As we mentioned with other Mercury Vapor lamp brands, We didn't believe the amazing claims that the manufacturers were claiming about these Mercury Vapor bulbs.
		This is the original brand of UVB Mercury Vapor Lamps but it is now relaunched with several excellent improvements.
		UVHeat bulbs are self ballasted Mercury Vapor bulbs so they will screw into a standard socket.
	www.bigappleherp.com /Reptile_Supplies/Product/Active_UVHeat_Mercury_Vapor_Lamps_261500.html (692 words)

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