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Slide projector - discharge lamp light source?

Discussion in 'Electronic Repair' started by N_Cook, Mar 1, 2011.

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  1. N_Cook

    N_Cook Guest

    Anyone aware of a make / model that used mercury or other discharge lamp
    light source for conventional ie 35mm photographic format slides, not
    scpecialised large format systems
     
  2. I'm a bit lost, here.

    Discharge lamps are not continuous-spectrum sources, and would probably not
    work very well when projecting color images. And with mercury, you'd have to
    filter out the UV, not to mention the ozone generated by the UV.
     
  3. N_Cook

    N_Cook Guest


    So am I, video projectors and back projected TVs seem to manage fine.
     
  4. Meat Plow

    Meat Plow Guest

    Do you need one or are you just thinking out loud? Are 35mm slides still
    popular? If you're not seeing them maybe the technology isn't calling for
    discharge illumination.
     
  5. N_Cook

    N_Cook Guest


    Just curious. Just repaired a Kodak carousel projector with 300W bulb and
    wondered what the power requirement for a lumen for lumen equivalent
    discharge lamp would be , or is it just smps gives the edge.
    But then is there a problem with smps supplying a filament lamp, in the way
    of thermal runaway
     
  6. Meat Plow

    Meat Plow Guest

    I think the technology is stagnant. Same goes for home movies on film.

    There isn't sufficient need to improve the design.
     
  7. Just curious. Just repaired a Kodak carousel projector with
    Agreed. Slide projectors never got past tungsten-halogen lighting.

    Discharge lamps would no doubt be more efficient. But... not only would you
    have to correct for color balance, but the bulb would have to be "mated" to
    the projector's optical system.
     
  8. Meat Plow

    Meat Plow Guest

    Large theater projectors are still an arc light ? There must be some
    sort of white/color balancing scheme for them. Same could be used on
    other forms of HID illumination.
     
  9. Discharge lamps would no doubt be more efficient. But...
    I'm not sure. I seem to recall that some use some form of tungsten lighting.
    Don't hold me to it.

    The "scheme" is simply to have a standardized color temperature. The prints
    can then be balanced accordingly.
     
  10. They're used for lighting on film and TV so can be pretty good. As well as
    for DLP etc projectors.
     
  11. tm

    tm Guest

    Speaking of HID lights, does anyone know where I can get a schematic for a
    Philips EUC 120 C/00 Lampdriver?



    Thanks,
    tm
     
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