oop's forgot

GTE Sylvania High Intensity Discharge lamps : Metal Arch, Engineering Bulletin 0-344

GTE Sylvania High Intensity Discharge lamps : Lumalux Lamps, Engineering Bulletin 0-348

GTE Sylvania High Intensity Discharge lamps: Mercury Lamps, Engineering Bulletin 0-346


--
Boomer

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"Boomer" wrote in message ...
: I hope I wasn't to aggressive :-)
:
: --
: Boomer
:
: Want to talk chemistry ? The Reef Chemistry Forum
: http://www.reefcentral.com/vbulletin/index.php
:
: Want to See More ?
: Please Join Our Growing Membership
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:
: If You See Me Running You Better Catch-Up
: "Boomer" wrote in message
...
: : I do not need to correct myself :-) and might add you have mis-read this and
: misexplained
: : some things
: :
: : I think it is more "Sorry Pszemol" please correct yourself : -)
: :
: : "which is not true to my knowledge. They do get ionized and they
: : emit UV light, which is turned into visible rays of light by the phosphors
: : mixture on the internal surface of the tubes... "
: :
: : Well, that is incorrect as the bulb does not generate enough energy to ionize Argon.
: What
: : makes you think it does.Only HID generate enough energy to ionize Argon. Do you have
: ref.
: : that states that Argon in fluro lamp gets ionized and produces light or are you just
: : assuming that ?
: :
: : "If you use UV-transparent glass
: : type to make the tube and do not use phosphors you would get the UV fluorescent tube."
: :
: : It is the Mercury that becomes vaporized and ionized that does that, producing UV not
: : Argon. You will only see Argon peaks in HID bulbs.
: :
: :
: : "It is not the pressure which generates light. "
: :
: : I never said pressure generates light, I said
: :
: : "Increasing bulb
: : pressure alone increases output, as the argon gas pressure increases, due to added
heat
: : and overdrive"
: :
: : and
: :
: : "Gas pressure = more lumens / watt"
: :
: :
: : Know where did I say pressure produces light, I said pressure increases output. A bulb
: : with no Argon gas, thus less pressure from heating and will have a lower efficacy
rating
: : than one with Argon. An Argon filled bulb would have a higher efficacy than a
non-Argon
: : filled bulb. The pressure reaches about 2-3 torr. Pressure lowers the wattage required
: to
: : attain x lumens / W. Nowhere in the GTE manuals does it even mention that Argon adds
at
: : all to the spectrum and there is no Argon peak in any SED Curve
: :
: : This is how things work;
: : When a fluro receives electrical current there is a passage of that current through
the
: : electrodes, called "Hot Electrodes", sealed at either end of the bulb. The heat
: generated
: : heats up the tungsten filament and its emissive material such as Barium, Strontium,
: : Calcium Oxide). As then become heated (950 C) they release electrons. These electrons
: : travel at high speed from one electrode to another. Other electrons are also released
by
: : the field differences of the electrodes. This produces an electrical discharge arch or
: : plasma. As these electrons and arch are produced it increases internal pressure,
causing
: : liquid Mercury in the tube to become heated, causing it to become vaporized and shed
: : electrons. This release of electrons from Mercury produces UV light. These electrons
: fall
: : back into orbit but only to be re-released again as the bulb is still receiving
current.
: : This "reaction" thus formed produces energy in the form of light and heat. The light
so
: : produced is UV at 253.7 nm. As this wave length hits the phosphors, materials that are
: : capable of converting wavelengths from short UV to longer visible wave lengths, there
is
: a
: : change in the type of light. In other words these phosphors are excited to
fluorescence
: by
: : UV to the proper wave length.
: :
: : Some known examples of phosphors and their colors
: :
: : Cadmium Borate = Pink
: :
: : Calcium Halophospahte = White
: :
: : Calcium Silicate = Orange
: :
: : Calcium Tungstate = Blue
: :
: : Magnesium Tungstate = Bluish White
: :
: : Strontium Halophosphate = Light Green
: :
: : Zinc Silicate = Green
: :
: :
: : Please consult
: :
: : GTE Sylvania Engineering Bulletin 0-341 (version 1 & 2 ), Fluorescent Lamps, 22 pages
: :
: :
: :
: : --
: : Boomer
: :
: : Want to talk chemistry ? The Reef Chemistry Forum
: : http://www.reefcentral.com/vbulletin/index.php
: :
: : Want to See More ?
: : Please Join Our Growing Membership
: : www.coralrealm.com
: :
: : If You See Me Running You Better Catch-Up
: : "Pszemol" wrote in message ...
: : : "Boomer" wrote in message
: : ...
: : : meaning Fluro's are filled with Argon gas, the purpose for it in these bulbs is to
: : become
: : : heated and increase the gas pressure. Gas pressure = more lumens / watt.. In MH,
MV,
: : HPS
: : : and LPS it is used for the same thing, but some of it also get ionized and adds to
: the
: : : light spectrum, so it is a duel purpose in these bulbs.
: : :
: : : Boomer, please, do not dissappoint me in your wisdom and correct yourself, please
:-))
: : : From above statement we can read that gases in the fluorescent tubes do not
: : : get ionized, which is not true to my knowledge. They do get ionized and they
: : : emit UV light, which is turned into visible rays of light by the phosphors
: : : mixture on the internal surface of the tubes... The ionization process is started
: : : by the high voltage surge when the bulb is powered on. Starting voltage is about
600V
: : : and depends highly on the lenght of the tube and the temperature of filaments on
both
: : : ends. Traditional tubes had filaments heated to support tube starting with lowered
: : : voltages. The new designs have rather high voltage and no heating.
: : : The bottom line: If you use UV-transparent glass
: : : type to make the tube and do not use phosphors you would get the UV fluorescent
tube.
: : : It is not the pressure which generates light. It is UV rays of ionized gas induce
: : : secondary emission from phosphors on the tube surface in the visible part of
spectrum.
: : : The pressure may influence other factors, but the pressure itself does not
: : : generate light - sorry Boomer :-)
: : :
: : : And to much pressure can make the
: : : bulbs go Kaboom, such as screwing a 175 watt into a 250 and a 400 for sure.
: : :
: : : Exactly - The increased risk of glass shattering is another reason against
: overdriving.
: : : I should mentioned this on my list before :-)
: : :
: : : p.s. Petition to The King Marc: do not interprete my message as aggressive again
: :-))))
: :
: :
:
: