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HID and MH lamps are absent from interior lighting!

Discussion in 'Electronic Design' started by Chris Carlen, Sep 10, 2005.

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  1. Chris Carlen

    Chris Carlen Guest

    Hi:


    Every once in a while I get interested in HID and metal-halide (MH)
    lighting systems. My recent spurt of interest was triggered by the
    possiblity that I might get to acquire a xenon short-arc lamp for my
    job. Oh will that be fun! But I have learned that there is almost no
    way that xenon short arcs to be attractive for consumer lighting. They
    aren't even particularly efficient. Just have the closest approximation
    to a white light point source.

    But I have often wanted to get my paws on a miniature HID (automobile or
    smaller size) for portable or task/desk lighting use.

    Yesterday I discovered this:

    http://www.walamp.com/lpd/lamptype/index.tpl?LTSKU=12413818101355&cart=1126201406819984

    The I found a portable dive light employing the 10W Solarc device very
    reasonably priced compared to the component prices from WelchAllen:

    http://www.uwkinetics.com/D_LC100.htm

    This is truly the coolest flashlight I have ever seen. A must have!

    But I am surprized at the lack of small HID or MH lamp fixtures for
    interior lighting.

    I will continue looking for a small HID/MH desk lamp or table lamp, or
    other interior fixture.

    Heh, heh, when I was a kid I came across both a 50W HP sodium and a 175W
    mercury vapor lamp fixture. I took them apart and then used to run them
    completely open. That is, no enclosure around the ballast transformers;
    the Hg lamp would stand up on its own on a table on the ballast core,
    and the Na lamp I put into a ceramic wall mount socket a few inches from
    the ballast that I could station somewhere on top of a bookcase.

    Man did those things light up the room! And the combined Na+Hg made for
    a decent color balance.




    Good day!
     
  2. Guest

    IIRR Bosch is selling arc lamp based car headlights. A quick google
    produced this

    http://www.findarticles.com/p/articles/mi_m3165/is_n11_v30/ai_15909832

    They are strictly for top of the range cars, because they aren't cheap.
    One of my old friends apparently developed the system at EMI Central
    Research (after it became a contact research organisation) and he was
    rather proud of the electronics.
     
  3. Ban

    Ban Guest

    Lets compare: a halogen front light in cars uses 55W and produces 1550lm,
    which is 28 lm/W
    a HID mercury lamp for the same application has 43W(with ballast) and is
    good for 3000lm, which is almost 70lm/W. Why do you think this isn't
    particulary efficient? (Source Osram)
    Hopefully the UV radiation at 234nm has not damaged your eyes when running
    the lamp without glass filter.
     
  4. Chris Carlen

    Chris Carlen Guest

    What is it you are trying to ask?
    They do have an outer glass envelope of course.
     
  5. Zak

    Zak Guest

    They are available. For example, look on www.lival.com. Often used for
    store lighting. Available colors seem to be 830 and 942, bulbs cost
    around 25 euro and the luminaires from 100.

    http://www.firstlight.nl/contents/nl/d204.html
    http://www.firstlight.nl/contents/nl/d255.html

    Philips cdm-t seems the used bulb here. Mind the warmup and re-strike
    timings though.
    If you have a big room - but garden lighting seems a natural to me.


    Thomas
     
  6. There's glass, and there's glass. Fused quartz glass is almost transparent
    deep into UV wavelengths.
     
  7. Ask this question of the folks over on sci.engr.lighting

    Its possible that such discharge lamps become less efficient and/or more
    expensive per lumen as their outputs are reduced to sizes appropriate
    for interior lighting (typical residential or office).
     
  8. Chris Carlen

    Chris Carlen Guest



    Almost all commercial arc lighting bulbs with screw-in bases have glass
    outer envelopes. It's the inner arc-tube which is fused-silica. The
    outer envelope makes it safe. Running it without the outer envelope
    would expose one to dangerous UV.
     
  9. Chris Carlen

    Chris Carlen Guest

    Yes, the Philips line I have found as well. That 20W CDM-T is really
    neat. Now I just need to find some decent priced fixtures in USA.



    Good day!
     
  10. Chris Carlen

    Chris Carlen Guest

    Yes, actually that is true, with the 10W HID lamps at about 45
    lumens/watt which is where LEDs are these days, and quite below larger
    MH/HID lighting in the 35W and up sizes. The 35W seems to be the
    breakpoint below which efficiency drops. 10W is about the practical
    lower limit of usefulness.

    Thanks for the tip. I forgot about that group.


    Good day!
     
  11. Ian Stirling

    Ian Stirling Guest

    Not to mention more fragile.
    The temperatures need to be quite high, so to avoid excessive losses through
    the electrode wires, you need them to be very thin - which means there
    is a compromise between robustness and efficiency.
     
  12. JosephKK

    JosephKK Guest

    Experimenter reproduces GW Lucalux lamps spectrum.
     
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