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  1. #1
    Shad's Avatar

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    Default Help florescent tube exposure unit owners

    We built a florescent tube exposure unit and are having some problems. For all you other people who built such a thing:

    What kind of bulbs are you using?
    What kind of positives are you using.
    What kind of emulsion?
    How far are your lights from your glass?
    How long is your exposure time?
    How thick is your glass?

    I know there are a few other factors, but I thought we bought all the right stuff but exposed at 33 minutes. 33 MINUTES! The table we used at MCAD exposed through unoiled bond in 1 and a half minutes. Help me, help others.

  2. #2
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    Tenebrini's Avatar


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    At first when we only had 3 40 watt bulbs our exposure times were 30min.

    Now we have 6 30watt bulbs and exposure is 10 min.

    We use something that ends with WR for emulsion

    The lights are about 4-6 inches from the glass and the glass seems to be about 1/4 inch thick.

    For positives we've had equal success with film and oiled xerox

    the bulbs are plain old flourescent bulbs from home depot

  3. #3
    Shad's Avatar

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    Default Re: Help florescent tube exposure unit owners

    What kind of bulbs are you using? Black light
    What kind of positives are you using. Bond
    What kind of emulsion? Ulano TZ
    How far are your lights from your glass? Eight Inches
    How long is your exposure time? 33 minutes
    How thick is your glass? Double Thick Plain Window Pane

  4. #4
    Shad's Avatar

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    Quote Originally Posted by cerdo
    At first when we only had 3 40 watt bulbs our exposure times were 30min
    We have 8 24 inch bulbs. We can only get them in 20 watt. I guess we should have gone with the four footers.

  5. #5
    gun sho's Avatar

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    Quote Originally Posted by Shad
    Quote Originally Posted by cerdo
    At first when we only had 3 40 watt bulbs our exposure times were 30min
    We have 8 24 inch bulbs. We can only get them in 20 watt. I guess we should have gone with the four footers.
    rich from luckybunny has a box with 16 4 ft black lights. they are about 3" from the glass i think and it exposes in about 1.5 minutes or something. talk to rich.

  6. #6
    gun sho's Avatar

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    Default Re: Help florescent tube exposure unit owners

    Quote Originally Posted by Shad
    What kind of bulbs are you using? Black light
    What kind of positives are you using. Bond
    What kind of emulsion? Ulano TZ
    How far are your lights from your glass? Eight Inches
    How long is your exposure time? 33 minutes
    How thick is your glass? Double Thick Plain Window Pane
    i think that your problem is between the low-output light source and the distance from the glass.

  7. #7
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    Quote Originally Posted by gun sho
    Quote Originally Posted by Shad
    Quote Originally Posted by cerdo
    At first when we only had 3 40 watt bulbs our exposure times were 30min
    We have 8 24 inch bulbs. We can only get them in 20 watt. I guess we should have gone with the four footers.
    rich from luckybunny has a box with 16 4 ft black lights. they are about 3" from the glass i think and it exposes in about 1.5 minutes or something. talk to rich.
    When I rebuild my tabe someday, that's what I'm going for.

    FAST BURN!

  8. #8
    Foocheck's Avatar

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    Get a couple more lights and make sure they are black lights.

    The distance should be alright. At home here I have 5, 15w-18in.-black lights about the same distance as you have. I expose through vellums at 3.5 minutes.

    If any of you guys have blueline shops in your town go there to have your films either printed or copied onto vellum. It's cheap and you don't have to deal with oil. That sounds shitty.

    So my 2 cents is a little more light power and go to a more translucent film.

  9. #9
    Shad's Avatar

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    Fuck it. For all the money we've dropped on 12 black light bulbs and ballasts, we can just take the shit back and buy a metal halide. I think that in this case, trying to go cheapy DIY was stupid.

  10. #10
    kozik's Avatar

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    just expose your screens to a photo of me. if they dont burst into flames you will get a perfect exposure in .000008 nanoseconds.

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