Thomas safe light

Discussion in 'Darkroom Equipment' started by Jorge, Oct 15, 2002.

  1. Jorge

    Jorge Inactive

    Messages:
    4,532
    Joined:
    Sep 6, 2002
    Shooter:
    Large Format
    Hi all, I got a thomas safe light through e bay and a couple of tubes, it appeared to be a good deal. So I got it today and pluged it and the light sure does not seem that bright. Heck my Zone VI LED is far brighter than the Thomas duplex. Did I get gipped? are the bulbs old and need to be replaced? I have always heard how much brighter these lights are and I am confused. [​IMG]
     
  2. bmac

    bmac Member

    Messages:
    2,156
    Joined:
    Sep 30, 2002
    Location:
    San Jose, CA
    Are you talking about the big hanging lights with the two doors? Amber lights? If so, there is someting wrong with it. The ones we used when I was in school were so bright we had to keep them 99% closed. This was in a 30X30' darkroom with 20 enlargers.
     
  3. Jorge

    Jorge Inactive

    Messages:
    4,532
    Joined:
    Sep 6, 2002
    Shooter:
    Large Format
    ah heck, I guess the bulbs are no good anymore. Darn!
     
  4. Sean

    Sean Admin Staff Member Admin

    Messages:
    9,339
    Joined:
    Aug 29, 2002
    Location:
    New Zealand
    Shooter:
    Multi Format
    Yeah, if it's a thomas duplex safelight it should be extremely bright. I kept the doors on mine almost closed. I think it takes quite a while for it to light up. Leave it on for 15 minutes then see how bright it is. It should be like a small sun at that point [​IMG]
     
  5. Jorge

    Jorge Inactive

    Messages:
    4,532
    Joined:
    Sep 6, 2002
    Shooter:
    Large Format
    [​IMG] Whooohooo....thanks Sean, I was too impatient, I did as you recommended and it sure was bright!
     
  6. Sean

    Sean Admin Staff Member Admin

    Messages:
    9,339
    Joined:
    Aug 29, 2002
    Location:
    New Zealand
    Shooter:
    Multi Format
    </span><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (Jorge @ Oct 15 2002, 04:19 PM)</td></tr><tr><td id='QUOTE'>[​IMG] Whooohooo....thanks Sean, I was too impatient, I did as you recommended and it sure was bright!</td></tr></table><span id='postcolor'>
    Cool! keep an eye on the gels, if they fade enough you might get some fogging... glad it's working [​IMG]
     
  7. ann

    ann Subscriber

    Messages:
    2,923
    Joined:
    Sep 10, 2002
    Shooter:
    35mm
    Be careful not to turn off by mistake. The unit needs to cool down before the light will come back up. Someone every session does this no matter what instruction is given to each class.
     
  8. Jorge

    Jorge Inactive

    Messages:
    4,532
    Joined:
    Sep 6, 2002
    Shooter:
    Large Format
    </span><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (ann @ Oct 15 2002, 09:24 PM)</td></tr><tr><td id='QUOTE'>Be careful not to turn off by mistake. The unit needs to cool down before the light will come back up. Someone every session does this no matter what instruction is given to each class.</td></tr></table><span id='postcolor'>
    I bet it drives you nuts!.....Thanks Ann!
     
  9. steve

    steve Member

    Messages:
    243
    Joined:
    Sep 12, 2002
    "Cool! keep an eye on the gels, if they fade enough you might get some fogging... glad it's working"

    The Thomas Duplex saftelight does not have "gels." There are two sets of glass filters. For black and white paper use, no filters are necessary as it uses sodium vapor tubes. The spectral transmission is so narrow that it is in and of itself, within the correct wavelength for the "safe" spectral area of the paper. Secondly, the safelight is made to be reflected from the ceiling and walls which gives a greater overall perceived illumination level, but results in much less intense light reaching the paper because of the light falloff (1/d^2).

    The second set of filters is for use with some color papers with the filter doors totally closed on the safelight, and the second filters stacked on top of the first ones. I have had one in my darkroom since 1982. I find it almost too brigh,t and use it with the doors only open about 3/4-inch - this is in a darkroom that is 10ft x 13ft.
     
  10. Jorge

    Jorge Inactive

    Messages:
    4,532
    Joined:
    Sep 6, 2002
    Shooter:
    Large Format
    Since I just got this thing I dont know much about them but I did take the filters apart and they are a piece of thin paper like material sandwiched between to clear glasses. It seems to me they would fade. But heck if you had yours since 1982 I guess mine would do fine. Thanks Steve.