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Side by side comparison of Single point vs fluorescent??

1056 Views 4 Replies 2 Participants Last post by  JeremiahInk, 
J
Does anyone know if there are any side by side, close up photos of spot color edges and halftones, comparing single point and fluorescent exposure units?

I'm struggling to understand the real difference between metal halide and fluorescent.
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sben763
JeremiahInk said:
I'm struggling to understand the real difference between metal halide and fluorescent.
Click to expand...

Attached is a diagram. The top shows the array of the UV beams. The bottom show the beams from a multipoint.

The multipoint will attack the stencil from many more angles then the single point. Therefore undercutting the stencil edges. This causes smaller dots when doing halftones and loss of about anything under 5-10%. This will cause ilregular edges. If you have a multipoint having your exposure times nailed will elimnate undisired results. Great prints can be had with multipoint but better with single point

multipoint at best can expose 5%-95% halftones but most expose 10%-90%. single point can easily obtain 5%-95% and can be 2%-98% with proper exposure

some other diagrams show the single point uv beams all going strait up but IMO thats impossible

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J
sben763 said:
Attached is a diagram. The top shows the array of the UV beams. The bottom show the beams from a multipoint.

The multipoint will attack the stencil from many more angles then the single point. Therefore undercutting the stencil edges. This causes smaller dots when doing halftones and loss of about anything under 5-10%. This will cause ilregular edges. If you have a multipoint having your exposure times nailed will elimnate undisired results. Great prints can be had with multipoint but better with single point

multipoint at best can expose 5%-95% halftones but most expose 10%-90%. single point can easily obtain 5%-95% and can be 2%-98% with proper exposure

some other diagrams show the single point uv beams all going strait up but IMO thats impossible
Click to expand...
Thanks Sean! Can you tell me if there is any difference between the edges of spot colors between the two types? Even if it's barely perceptible? I was recently told that you can't see the difference between spot color edges so much as sense it?? Like that the single point exposure will just make a spot color look overall crisper.
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sben763
If you nail your exposure times with a properly preped, coated, dry screen you can't tell the difference with spot colors or even simulated unless there was a ton of 2%-9% and 91%-99% halftones.

But like I said you have to work with all those variables. Another single point option is a 500-1000w work light with the glass removed 16"-18" from screen.
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J
Sounds good. I mean losing 20% of your half tones seems like a lot but I can see that for most jobs florescent is probably fine.

Thanks for all your help on these boards too! Lately all my searches include "sben" in them so I can find the best threads! :)
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