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exposure lighting

 
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Old 1 Week Ago Oct 2, 2019 4:49:48 PM -   #1 (permalink)
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Default exposure lighting

I am trying to burn a screen and am not having any luck. I am using a 5000 Lumen light for my exposure, with the glass still on. I did my first for 9 minutes and I could see the stencil, but could not get all the emulsion out. Tried again for 12 minutes, got more emulsion out, but remaining emulsion absorbed water and screwed up stencil. Thinking of taking glass off of light but not sure how much that will truly help. Am I under exposing, and just need to leave under light longer?
 
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Old 1 Week Ago Oct 2, 2019 10:29:30 PM -   #2 (permalink)
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Default Re: exposure lighting

What kind of light is it? Halogen, incandescent, something else? What was it originally made for?

If it is an LED, forget it. They do not waste energy making undesirable wavelengths (UV being undesirable for normal uses for which most lights are made). If it is a halogen work light, yes take off the glass. It is there to protect your eyes from UV.

There are UV LEDs available both as strips (which you'll need to solder and wire up to a power supply) and single point fixtures. Something with a spectrum around 390-415 should probably work with most emulsion.
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Old 22 Minutes Ago Oct 10, 2019 11:24:16 AM -   #3 (permalink)
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Default Re: exposure lighting

"There are UV LEDs available both as strips (which you'll need to solder and wire up to a power supply)"

Do this! I did and my exposuers take 3 secs,
 






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