Underpowered UV exposure box?

Discussion in 'Wet Process Machine & Traditional Prints' started by Ecoleica, Feb 10, 2015.

  1. Ecoleica

    Ecoleica Member

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    Hi all, I am fairly new to alternative printing and I have been wanting to get consistent results with my cyanotypes (soon to be salt prints). So i contacted a local screen printing company that makes their own uv exposure boxes and purchased one of their units. I have done a bit of experimenting with it and it seems woefully underpowered for digital negatives (one step print took around 2 hours to expose!). I have attached a photo of the box. Currently there are 6x T5 8W tubes. Now I can always add more T5 Tubes to the unit or I could start from scratch and build something bigger and more powerful myself. What are your thoughts?

    IMG_3566.jpg
     
  2. pschwart

    pschwart Member

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    You can do a lot better than that box.

    Build your own with at least 8 T8 BL bulbs.
    Use electronic ballasts.
    The bulbs are way too far apart in the unit you purchased.
    Install a fan to keep the bulbs cool.
    I think a pizza oven design (with a door) is safer and provides better cooling
    18" BL bulbs can be had for about $4 each and they last for years.
     
    Last edited by a moderator: Feb 10, 2015
  3. Doyle Thomas

    Doyle Thomas Member

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    could be your chemistry too
     
  4. OP
    OP
    Ecoleica

    Ecoleica Member

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    No issue with the chemistry that i know...I get good results when using the sun as a UV source
     
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