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I hear Plasma TVs are power hogs

Discussion in 'Electronic Repair' started by [email protected], Jan 29, 2008.

  1. Guest

    I wish we could find a comparison of all the same size sets. I guess
    they dont make small Plasma sets though, and what is the limit of a
    CRT size? I do know the LCD sets come in all sizes though. I just
    looked at one a few days ago which was a 19". Nice picture, but
    costly. I would never buy a tv larger than 25". I dont have room for
    it. I also do not care for loud blaring sound on a tv. Just a plain
    single speaker is fine with me, stereo is a little better.
    My current tv is a 25" CRT stereo with 2 small speakers. That's all I
    want on a TV. I occasionally like listening to music kind of loud on
    my stereo, but having commercials blasting on a tv is not my cup of
    tea. When I was a Best Buy and asking some questions about a tv, they
    had a display that was so loud I could not hear the guy and I had to
    yell and repeat many times. I finally asked the guy to turn that damn
    thing down. If he hadn't, I would have walked out the store.

    On the other hand, I have seen some of the SDTV sets in the stores
    with a CRT that look really nice. I dont think they make a HDTV with
    CRT (or do they?).

    One other thing, I noticed a demo tv at B.B. It showed a split
    screen. One one side it said HDTV, the other side said Conventional.
    I spent awhile looking at it. The pictures were identical, but on the
    HDTV side they were much brighter. After awhile I realized all they
    really did was lower the brightness and contrast on the "conventional"
    side. In other words, it was just fake. If for no other reason, it
    was on the same screen. I see no way they could have half the screen
    being LCD and the other half being CRT, or LCD conventional. Just
    another advertising gimmick.
     
  2. James Sweet

    James Sweet Guest

    The largest commercially available direct view CRT was a 40" made by
    Mitsubishi. I fixed one once, it was immensely heavy but the picture did
    look pretty good.


    Sure they do, we have a number of them at work as well as I have a HD CRT
    rear projection set at home, the only reason I got it was because it was
    free, nice set though and looks nice for watching DVDs at 640p which is all
    I ever use it for, I quit watching broadcast TV years ago.. It supports
    1080i as well, which I'm sure I'll use at some point once the HD format war
    is over and prices come down on players. The 56" 16:9 screen makes movies
    look great, it is bulky but I've got plenty of space. You can display HD
    content on a standard SVGA computer monitor as well. HD vs SD is independant
    of the display technology.

    Even a cheap set looks good for SD, it's quite a testament really to how
    refined CRT technology really is.

    The resolution could have been artificially lower on the SD side, but the
    comparison is still not really fair since the screen is still running at the
    HD resolution.

    Another gotcha is that SD content looks really poor on most HD sets, much
    worse than it does on a good SD set.
     
  3. Guest


    I was thinking the same thing. I'm in WI, not far from MN, and with
    the severe cold we have had the last few weeks, I finally removed most
    of the CF bulbs in my garage. They were so dim when I turned them on,
    I could not see the tools in my toolbox, and they never got to full
    brightness. That's when I removed over half of them and put in
    incandescents. Much of the time I go to the garage to get a tool to
    bring in the house, I'm half frozen, and I got to stand there till the
    damn things get sort of bright so I can see my tools. It's too cold
    to be standing there, and I have better use of my time than waiting
    for them damn things to get bright.

    Then too, when will they ban them because of the mercury in them?
    They might save some energy, but they are highly polluting.
    Incandescents are just glass and metal, and aside from the tiny bit of
    lead solder on the base, they are not a pollutant. (maybe they dont
    use lead on them now, I am not sure).

    One other thing. I have now had two of them literally blow smoke and
    sparks. One was in my bathroom, and the whole room became filled with
    some really stinky smoke, and I could see sparks inside the plastic
    base. I shut it off, but still wonder if it could have started a
    fire. Worse was one in the garage that actually blew sparks out of
    it, and not far away on the floor under the light, I had a gasoline
    can. If I had just poured some gas and there was some on the outside
    of the can, that could have been a disaster. Since then, I do nto
    trust them, and have not bought anymore of them. I'm just using the
    ones that were still there.

    Halogen bulbs are notorious for being extremely hot, and are far more
    able to start a fire than an incandescent. They are not all that more
    efficient than a incandescent anyhow, so they are not a good solution
    if you ask me.

    I trust the old florescent fixtures much more than these CF bulbs and
    they do save energy. But again, in cold weather they are helpless.

    I think if there is any hope for energy saving bulbs, it will be the
    LED. But for now, they are too blue and not bright enough. However,
    I think they have potential.
     
  4. They're not highly polluting. They have very little mercury, and it's
    elemental rather than organic.

    If you hardly ever go into the garage, and/or for short periods, CFLs don't
    make much sense.
     
  5. Guest

    Could you please explain the elemental VS organic part.
    I am beginning to realize that. Whiel on occasion I do spend hours in
    there (usually only in warm weather), the rest of the time I am only
    in there for a few minutes at a time. About the only time I spend any
    extended time in there during cold weather is when the car breaks
    down.
     
  6. Guest

    What is a Metal Halide bulb?
    Do they use standard fixtures or need a ballast or other special
    fixture?
     
  7. James Sweet

    James Sweet Guest

    The halogen bulbs in question have the quartz capsule contained inside a
    glass outer bulb. They run no hotter externally than a standard
    incandescent, they're not a lot more efficient, but enough more to be legal.

    LEDs do have potential, but they have a long way to go for general
    illumination. I'd guess that in a decade or so they'll be quite mature.
     
  8. James Sweet

    James Sweet Guest

    It's a high intensity discharge lamp, a modern close cousin to the mercury
    vapor lamp widely used in street lighting for decades. They require a
    special fixture and ballast, though a rare few screw-in internal ballast
    replacements are available. Modern ceramic metal halides are fantastic, CRI
    in the 85-90 range depending on color temperature, 8K-12K rated life, very
    compact lamps with a nearly point source emission and higher efficiency than
    fluorescent. I use several 39 and 70W versions around my house with a
    combination of fancy electronic and conventional magnetic ballasts but I'm a
    lighting geek. CMH is used mostly in high end retail displays right now but
    will probably be more common as prices drop. If you see a window display in
    a clothing store lit by bright warm white light of almost incandescent with
    perhaps a slightly pinkish tinge to it, you're probably looking at 3000K
    ceramic metal halide. Philips Mastercolor and GE ConstantColor are the two
    lines I've worked with.

    Caveats include high cost, relatively long warmup time compared to CFL (but
    they will warm up fully in sub zero temps), and when you shut one off, it
    has to cool for several minutes before it will fire up again, but this is
    not a problem for dusk till dawn or timed applications where I use them.

    www.lamptech.co.uk has a whole ton of great info.
     
  9. msg

    msg Guest

    wrote:

    Here in Duluth, we have a number of large LED billboards that appear
    as bright at -30F as they do at 70F which testifies to the potential
    of LED illumination across a mil-spec temp range.

    Michael
     
  10. Sjouke Burry

    Sjouke Burry Guest

    cut

    Well, my CFLs did almost nothing below freezing.
    And it is quite inconvenient to have to wait 5 minutes
    after switch on, before you can see enough.
    And leaving them on, sort of contradicts the purpose of
    energy saving.
    I replaced them with ordinary FL tubes.
     
  11. Guest

    For very cold areas, garages, sheds etc.How about those Quartz Halogen
    lights? They could/might supplement CFLs/Incandescant lights.The Quartz
    Halogen lights used only for very cold areas.I don't know if that would
    work so good though.
    cuhulin
     
  12. GregS

    GregS Guest

    Ban them all.

    Its easy to put your hand around the vents and judge effectiveness.

    greg
     
  13. Yes. Mercury is poisonous, regardless of its form. But my understanding is
    that pure mercury is not as poisonous as organic compounds containing
    mercury.

    Several years ago, a member of rec.antiques.radio+phone told the group that,
    as a child, he'd drunk almost a pound of liquid mercury -- and lived. (Well,
    yeah, duh...)
     
  14. JW

    JW Guest

    I'm a bit skeptical about THAT one...
     
  15. So was I, but he was a regular member of the group, and I saw no reason to
    disbelieve him.
     
  16. bz

    bz Guest

    It is good to be skeptical, but the story is probably correct.

    Mercury has a laxative effect. It has been used for one.
    http://www.apug.org/forums/archive/index.php/t-45181.html


    Metallic mercury is most hazardous when you are exposed to the vapors.
    Heating it can be rapidly deadly. Do NOT try to repair a PCB that has had
    mercury spilled on it!
    [I scrapped a computer because it had had a mercury manometer laid down on
    top of it. There was mercury EVERYWHERE inside.]

    Having mercury spilled in your work area can be deadly over an extended
    period of time as even at room temperature, mercury has a high enough vapor
    pressure to expose you to a hazardous level.

    But brief (like days for the mercury to pass through the digestive system)
    exposure to metallic mercury is unlikely to kill you.




    --
    bz

    please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
    infinite set.

     
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