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Is it a UV lED or a regular one?
A regular one won't do anything.
A 120w UV LED will do a reasonable job if it is a 395nm one (they tend to come in two readily available wavelengths of 365nm and 395nm - anything else is a specialist product). If you can find one at 405nm it would probably be better.

It won't be super fast because you will need a relatively large focal distance (height above the screen) to get a good exposure.
 
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