Making UV box pt/pd.

[W0jciech]

hi guys,
im 'bout to build my first uv exposure box for pt/pd, and have a little question for y'al. Whats the most optimal value of vats/volts for exposure times not to exceed 10 minutes. Will 50W will be enough?

 

[koraks]

What kind of light source and what print size, and what distance between the light source and the contact frame are you aiming at?

For carbon I try to aim for around 100W for 4x5" up to around 30cm distance using 365nm or 400nm LED, and around 300-400W for 8x10". That's probably more than you'd need since carbon can be pretty slow.

You can probably get away with 50w to 100w for 8x10" size or thereabouts. 50W is a bit on the meager side though, IMO.

So it boils down to: it depends...

 

[W0jciech]

What kind of light source and what print size, and what distance between the light source and the contact frame are you aiming at?

For carbon I try to aim for around 100W for 4x5" up to around 30cm distance using 365nm or 400nm LED, and around 300-400W for 8x10". That's probably more than you'd need since carbon can be pretty slow.

You can probably get away with 50w to 100w for 8x10" size or thereabouts. 50W is a bit on the meager side though, IMO.

I planned to use 2x 75W bulbs, and fill space in box with uv led stripes, print not larger than 8x10". I planned to use it for pt/pd tho

 

[koraks]

What kind of bulbs?
Why a combination of bulbs and strips?

 

[Rolleiflexible]

Have a look at this thread:

Do exposure times affect print quality?

I just built a UV LED light box, using inexpensive (but well-built) self-contained fixtures from Onforu (Amazon). They dramatically shorten my exposure times from eight minutes to 30 seconds. An unexpected bonus: The prints I am pulling with them also seem to have darker blacks, clearer...

www.photrio.com