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Building an exposure unit.

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ivescreenedforless
Posted: Fri May 07, 2010 3:19 pm Reply with quote
Joined: 30 Sep 2007 Posts: 150
I think it's about time I upgrade my exposure unit. I have decided to go with something like this.




I will use 8 or 12 F20T12/BL. Black lights without the protective coating. 24 inches long.

Found here http://www.1000bulbs.com/Black-Light-...scent-Tubes/1246/

These ballasts were suggested by one of these light bulb websites through email.

http://www.lightingsupply.com/WH8-120-L.aspx

or

http://www.lightingsupply.com/WH5-120-L.aspx

I think I will use 2 of the WH8-120s as they can power up to 6 bulbs each.

and these sockets.
http://www.1000bulbs.com/T8---T12Standard-Sockets/33918/

Some kind of on/off switch, glass, wood to build the body, beer.

I'll keep posting as I make progress and make a tutorial out of it.

Has anyone built something similar or have any suggestions?

It should cost less than $300
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joystickcriminal
Posted: Fri May 07, 2010 4:27 pm Reply with quote
Joined: 30 Oct 2003 Posts: 274 Location: York,PA
Very cool, I thought about making one myself, keep us updated!
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ivescreenedforless
Posted: Sun May 09, 2010 4:59 pm Reply with quote
Joined: 30 Sep 2007 Posts: 150
Placed my order today.

I decided to go with

6 Bulbs http://www.1000bulbs.com/Black-Light/1246/
1 Ballast http://www.1000bulbs.com/Fulham-Ballast-Workhorse-8/6189/
12 Sockets http://www.1000bulbs.com/T8---T12Standard-Sockets/3775/

$ 95.04... not bad.

I figured 1 ballast can power 6 bulbs, and that should be enough. No need to spend $60+ for a few more bulbs and 1 more ballast.

Next we build!
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masonmayhem
Posted: Mon May 10, 2010 3:40 pm Reply with quote
Joined: 28 Oct 2004 Posts: 1376 Location: Redneck Riviera, AB
i'd like to know what your exposure time is when you're done. i currently use an exposure unit/vacuum table from Lancer that is probably more than 13 years old. it uses 10 F20T12/BL lights and my exposure time is 3:15.

a friend of mine has a different exposure unit with the same lights but his burn time is only 30sec.

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ivescreenedforless
Posted: Mon May 10, 2010 4:26 pm Reply with quote
Joined: 30 Sep 2007 Posts: 150
I'll def let you know.

I'm sure you have but, have you replaced the bulbs recently?

Same emulsion?

It could be that the parts inside are just old and weak. Maybe the ballast doesn't crank as much power as his.

I'm no expert, just some ideas.
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Sticks
Posted: Mon May 10, 2010 4:31 pm Reply with quote
Joined: 07 Feb 2003 Posts: 10327 Location: Raytown Travel Agency
If you "expose ur unit," you may get in big trouble w/the cops!
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masonmayhem
Posted: Tue May 11, 2010 4:13 pm Reply with quote
Joined: 28 Oct 2004 Posts: 1376 Location: Redneck Riviera, AB
ivescreenedforless wrote:
I'll def let you know.

I'm sure you have but, have you replaced the bulbs recently?

Same emulsion?

It could be that the parts inside are just old and weak. Maybe the ballast doesn't crank as much power as his.

I'm no expert, just some ideas.


actually those are good points. i should check into that.

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ivescreenedforless
Posted: Thu May 20, 2010 10:13 pm Reply with quote
Joined: 30 Sep 2007 Posts: 150
Here is my exposure unit without the bulbs or glass. I still need to get the glass from somewhere.

$95 for electrical
$50 for wood(I bought a whole ply of some fancy birch)
$15 for hardware/screws
$?? for glass.
About $160 spent so far.

I'll post tomorrow with a little tutorial of the construction.

(click for big)

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ivescreenedforless
Posted: Sat May 29, 2010 11:42 am Reply with quote
Joined: 30 Sep 2007 Posts: 150
Sorry guys, my internet was out for like a week.

I got glass at a small hardware store for about $13, home depot doesn't cut custom glass.

I've exposed a few screens with some of that speed ball emulsion. So far 4 minutes is about the perfect time. I've had limited success with good halftone exposure but that's mostly due to my films not being super black and not getting solid contact with the screen.

Some sort of vacuum mod would be an excellent addition.

So far I am very happy with my results. They are consistent and predictable unlike my old halogen light.

I've been busy with other things but I promise I will make a detailed tutorial and list of materials.
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hank1113
Posted: Tue Aug 24, 2010 11:57 am Reply with quote
Joined: 30 Apr 2009 Posts: 3639 Location: Richmond Va
I am starting on my box shortly. I will update this thread with what I am doing. going to be very similar. but bigger.

thanks for posting the light site!

hank

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