Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,545   Posts: 1,544,445   Online: 1014
      
Results 1 to 6 of 6
  1. #1

    Join Date
    Aug 2004
    Shooter
    Multi Format
    Posts
    463
    Images
    6

    Compact Fluorescents and UV output

    Do the spiral type of Compact Fluorescent lights put out enough UltraViolet to use a batch of them for alt process exposure light sources?
    I know they can be slow to get to peak power but that can be remedied by a screen blocking them until I put the coated pt/pd paper in front with the vacuum frame.

    Anyone with experience or info is welcome to chime in.

  2. #2

    Join Date
    Nov 2003
    Posts
    5,240
    Images
    9
    Look up spiral bulbs there have been a few posts about them.

    Here is one such thread:
    http://www.apug.org/forums/forum42/2...ght-bulbs.html
    Last edited by mark; 03-20-2008 at 04:51 PM. Click to view previous post history.
    Technological society has succeeded in multiplying the opportunities for pleasure, but it has great difficulty in generating joy. Pope Paul VI

    So, I think the "greats" were true to their visions, once their visions no longer sucked. Ralph Barker 12/2004

  3. #3
    keithwms's Avatar
    Join Date
    Oct 2006
    Location
    Charlottesville, Virginia
    Shooter
    Multi Format
    Posts
    6,079
    Blog Entries
    20
    Images
    129
    Most fluorescents give emissions from mercury vapour, which produces strong but narrow lines peaked at various wavelengths in the UV:



    The lines are or course not as narrow as they are depicted in this plot, but they are indeed rather narrow. So narrow that you might miss the sensitivity curve for your particular alt process. We had a discussion about this recently at hybridphoto. So, my [amateur] feeling is that fluorescents are sort of hit and miss for alt process stuff, even if you do get up to significant output at a particular wavelength. The side effect can be inability to build enough contrast in the print and so forth.
    Last edited by keithwms; 03-20-2008 at 04:53 PM. Click to view previous post history.
    "Only dead fish follow the stream"

    [APUG Portfolio] [APUG Blog] [Website]

  4. #4
    David A. Goldfarb's Avatar
    Join Date
    Sep 2002
    Location
    Honolulu, Hawai'i
    Shooter
    Large Format
    Posts
    17,284
    Images
    20
    Not normal ones. I can work with sensitized albumen paper under CFL room lighting, and I don't get any fog. I tested some scrap paper fairly close to a CFL lamp, and it took quite a while to produce a visible effect. I don't know if there are UV CFLs, but if they are, I assume they would have the same output as normal UV fluorescent tubes like BLBs and such.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
    Photography (not as up to date as the flickr site)--http://www.davidagoldfarb.com/photo
    Academic (Slavic and Comparative Literature)--http://www.davidagoldfarb.com

  5. #5
    Monophoto's Avatar
    Join Date
    Aug 2004
    Location
    Saratoga Springs, NY
    Shooter
    Multi Format
    Posts
    1,691
    Images
    44
    Quote Originally Posted by David A. Goldfarb View Post
    Not normal ones. I can work with sensitized albumen paper under CFL room lighting, and I don't get any fog. I tested some scrap paper fairly close to a CFL lamp, and it took quite a while to produce a visible effect. I don't know if there are UV CFLs, but if they are, I assume they would have the same output as normal UV fluorescent tubes like BLBs and such.
    BLB spirals are available and work very well for alternative processes. They have the advantage of being self contained and not requiring an external ballast. On the other hand (and there is always that other hand), most home centers don't carry them. But there are bulb wholesalers on the web who do offer them. Here's a link:
    http://www.bulbman.com/index.php?mai...ducts_id=16788

    My UV printer uses six 27watt spirals on six inch centers, and with the ends of the bulbs six inches above the surface of the contact printing frame.
    Louie

  6. #6

    Join Date
    Jan 2006
    Shooter
    Multi Format
    Posts
    905
    the other option is a plate burner, they're nearly always inexpensive, just take a little legwork or a few $$ on ebay. One benefit is that they already have a vacuum frame, as well as having significant UV output, as printing plates are sensitive to UV.


    erie



 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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