screen printing > DIY - From master engineered marvels to cobbled together jury-rigged or Jerry-built junk!

DIY Exposure Unit Question.

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Sbrem:
Metal Halide will give you the proper color temperature (with the proper bulb for your emulsions) but one is sufficient for halftone (the best halftones come from using a "point source" light). My theory is that more than one source undercuts your dots; however, some of the testing I've heard about here regarding the new LED light sources use an array, but the fast exposure times seems to take care of the undercutting issues. But I digress, use one lamp, and if you can get higher wattage lamps, all the better. If you enclose it, make sure it gets plenty of air...

Steve

JackThrasher:
I had to put my project on hold for the time being... Gonna get back to it next summer though!! I really appreciate all the fantastic info!!! Cheers to all and happy printing

Denis Kolar:
About 4.5 years ago I was going to build my own exposure unit too.
Same set-up, 400W MH light, build a box, vacuum, blanket and all that jazz :)

Luckily, a day before I went to Home Depot to buy supplies I checked eBay one more time.
Now, I use Nuarc 40-1K with a 1000W Mercury light and I love my decision to buy it instead of building my own.
Paid around $400 for it and it still kicks ass. Burning screens in 75-90 seconds, depending on the mesh. Using Chromaline SBQ emulsion.

Do not do many screens a month, so that time is OK, no need for a 10-20 seconds exposure.

Check eBay, Craigslist and Digitsmith before building one yourself.

Homer:
I got  Douthitt unit here you can snag from me for 250.00...

mimosatexas:
Why can't you live closer to me Homer...I always want what you're sellin'

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