Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 68,660   Posts: 1,481,552   Online: 946
      
Page 3 of 5 FirstFirst 12345 LastLast
Results 21 to 30 of 41
  1. #21

    Join Date
    May 2013
    Location
    Finland
    Shooter
    35mm
    Posts
    74
    Hi Ian! Thank you for the links. I must confess I was expecting longer life-times. But there are so many things to consider when starting-up. I'm learning...

  2. #22

    Join Date
    Jul 2011
    Shooter
    8x10 Format
    Posts
    2,287
    OK. I get it ... I did look up the bulb. But it's hard to imagine that an enlarging head was designed using something only a notch above an applicance bulb, intended for cheap amateur slide projectors, and frankly, a style of bulb infamous for temp or handling shock. But these bulbs are still made in quantity and dirt cheap, so you keep a number on hand until you find a better light source for your enlarger chassis.

  3. #23

    Join Date
    Aug 2005
    Location
    Los Alamos, NM
    Shooter
    Multi Format
    Posts
    2,015
    I have a fairly similar Beseler Dichro 35 that I use for 35mm. The lamp has lasted for years. A few things to check: Are you using the correct lamp? - there are a lot of similar lamps, and not all of them are designed for line voltage; are you operating the enlarger at the designed line voltage? did the lamp have fingerprints or grease on it? - these can make the lamp fail; was the lamp installed correctly? - this can be tricky, and what looks right may not be correct.

  4. #24
    Paul Glover's Avatar
    Join Date
    Jun 2013
    Location
    Salem, VA
    Shooter
    Multi Format
    Posts
    76
    Quote Originally Posted by Hatchetman View Post
    I wonder if there is an LED option? Probably would cost an arm and a leg....
    There are places making LED heads (white light and variable contrast) for some enlargers. They are not cheap. Some people have made homebrew LED heads that work, too.

    I'm early on in the process of testing an off-the-shelf 60 watt equivalent LED which cost $10 at my local Lowes (a Utilitech Pro bulb). I had to choose carefully because many of these have very uneven light patterns or oddball designs or other quibbles which would make them unsuitable as a condenser light source on a timer, luckily my old timer has mechanical relays and will switch the small load of an LED bulb without trouble. The bulb I'm trying out illuminates very evenly across its surface just as the PH140 does and puts out maybe 3/4 of the level of light which is still plenty. But I need to bodge together a lamp holder which will position it at the right height as it's about an inch longer than the PH140 and a bit too wide to fit in the stock lampholder; the heatsink fins prevent it from screwing in properly, though it will fit down into the lamphouse without any problem. Even then, I'll have to see how it affects contrast.

  5. #25
    Hatchetman's Avatar
    Join Date
    May 2011
    Location
    Chicago, IL
    Shooter
    Multi Format
    Posts
    436
    Images
    4
    Quote Originally Posted by Paul Glover View Post
    I'm early on in the process of testing an off-the-shelf 60 watt equivalent LED .
    Let us know how it turns out! I would not count on these bulbs being available forever.

  6. #26
    bobwysiwyg's Avatar
    Join Date
    Mar 2008
    Location
    Ann Arbor, MI U.S.A.
    Shooter
    Multi Format
    Posts
    1,537
    Images
    3
    Interesting. Keep us posted on how this goes. I have been converting our lights over from incandescent and CFL to LED's. I've installed several of the same Utilitech bulbs in household fixtures which had 60w incandescent bulbs. In particular, four in two ceiling fixtures in our upstairs bedroom. I never mentioned it to my wife, and the next day she asked, "is it just my imagination, or are the bedroom light brighter?" They were, but hardly a scientific evaluation plus the incandescent bulbs were fairly old, so I expect they had lost some "shine." LED bulbs have improved quite a bit in the past few years and the prices are finally coming down out of the stratosphere.
    WYSIWYG - At least that's my goal.

    Portfolio-http://apug.org/forums/portfolios.php?u=25518

  7. #27
    bobwysiwyg's Avatar
    Join Date
    Mar 2008
    Location
    Ann Arbor, MI U.S.A.
    Shooter
    Multi Format
    Posts
    1,537
    Images
    3
    Quote Originally Posted by Hatchetman View Post
    ..I would not count on these bulbs being available forever.
    What bulbs are you referring to?
    WYSIWYG - At least that's my goal.

    Portfolio-http://apug.org/forums/portfolios.php?u=25518

  8. #28
    Hatchetman's Avatar
    Join Date
    May 2011
    Location
    Chicago, IL
    Shooter
    Multi Format
    Posts
    436
    Images
    4
    Quote Originally Posted by bobwysiwyg View Post
    What bulbs are you referring to?
    incandescent enlarger bulbs

  9. #29

    Join Date
    May 2013
    Location
    Finland
    Shooter
    35mm
    Posts
    74
    Quote Originally Posted by Paul Glover View Post
    There are places making LED heads (white light and variable contrast) for some enlargers. They are not cheap. Some people have made homebrew LED heads that work, too.

    I'm early on in the process of testing an off-the-shelf 60 watt equivalent LED
    I'm also interested. In here LED lamps are resonably priced, I'm not sure if because of european energy-saving regulation. But I could not find anything more powerful than 40W equivalent.

  10. #30

    Join Date
    Jun 2007
    Shooter
    35mm
    Posts
    787
    The larger power LED lamps are available from any specialist lighting shop here (in NL) but they never seem to appear in a supermarket or normal high street place.

    The larger LED lamps (yes, I don't mean CFL) I have used in light-fittings still seem to have a short but noticeable turn-on time, perhaps a tenth or a fifth of a second. I have no idea if that is consistent or not, but it may be an unwanted variable for short exposure times. Apart from the location of the illumination with respect to the condenser(s) of a black-and-white enlarger, the other question-mark would be about the spectrum of the colour temperature of these lamps and whether there are any peaks or troughs compared to incandescent lamps. The only thing to do is try them and see I suppose!

    I'm half wondering about using one of the industrial, high-brightness LED's as a pseudo spot-source but I'm uncertain about the effectiveness of a pre-existing condenser in this case. Another thing that has to be tried out probably. Perhaps there will be a metal-work project swapping for my De Vere Varicon lamp-house this winter . . .

Page 3 of 5 FirstFirst 12345 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin