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  1. #1
    Salmonoid's Avatar
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    Apr 2006
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    Lightbox-Grow lights or Black Lights

    I built a light box with a couple of fluorescent tubes. I have grow lights in it right now and it makes a good exposure to my cyanotypes in about an hour. I am wanting to reduce the exposure time, and am wondering if black lights will work better.

    Tim

  2. #2

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    Nov 2007
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    Tim,

    It seems you just need a few more tubes. If as you say you have only a 'couple' of tubes then you probably have something like 80watts output?

    For Pt/Pd printing I use 9 x 25 watt BLB, black light blue (filtered) which gives me an average exposure of between 3-6 minutes at a distance of 6" from the lamps.

    Trevor.

  3. #3
    Whiteymorange's Avatar
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    I bought a "facial tanning unit" from that auction site for my polygravure exposures (KM73 plates) My exposures are in the 45 second range at 5 inches. Cheaper by far than building an exposure bod with blacklight bulbs. I set the timer on the unit to a long time and then use a GraLab timer for more precise timing.



 

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