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  1. #21
    largeformat pat's Avatar
    Join Date
    Jan 2008
    Location
    Upper Hunter NSW Australia
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    8x10 Format
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    This is interesting. I have a L184 with a T12 head. Wouldn't mind variable contrast Do think I could fit it into a box about the size of the t12 head? Or do you think it would be to close?
    Pat
    What grain............................................. ...............
    Oh sorry, I forgot you don't shoot Large Format
    Large format Pat.

    http://www.largeformatpat.com

  2. #22

    Join Date
    Nov 2005
    Location
    San Clemente, California
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    1,169
    Note that Geary's profile indicates his last activity here was 2-5-09.

  3. #23
    CBG
    CBG is offline

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    Nov 2004
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    894
    Regardless of the last activity from the OP, the subject of a home-brew LED split grade head keeps nagging at me. I can't think of any reason it should not work. I have considered using the screw in pre wired multi LED "bulbs" that one can just screw into a 120 V source. Green and blue/UV.

    I have been using LEDs from www.superbrightleds.com for split grade contact printing and red LEDs for safelighting.

    I'm not interested in the mechanics of wiring LEDs myself so the simplest screw in household voltage bulbs make sense to me. The work very well for safelights. and the greens and blue/UVs are so bright I have to bounce them off a dark surface to have usefully long printing times. I would like eventually to be able to print large to very large, so intensity is very important to me.

    The bulbs are on this page. http://www.superbrightleds.com/cgi-b...cs/E27-W24.htm

  4. #24
    BetterSense's Avatar
    Join Date
    Aug 2008
    Location
    North Carolina
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    35mm
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    2,906
    To the OP. Is this enlarger an 8x10 diffusion type enlarger? So there is a sheet of diffusion material between the LED lights and the negative? About how far from the negative is the LED panel?

    In the future I may wish to make a similar LED head, so your LED layout diagram is very informative. However, there are no units included, so I'm left wondering the scale of the layout. Do the squares have a certain size to them? If it's not too much trouble could you measure across the extreme diagonal blue LEDs?
    Attached Thumbnails Attached Thumbnails LEDgridd.jpg  
    f/22 and be there.

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