UV nanometer

waynecrider · Jun 13, 2006

What's the nanometer rating for UV bulbs for alt printing. I ask as I see that Aristo Grid has 351nm bulb replacements for Graflarger's. Would these be bulbs for specialty priinting purposes outside alt requirements?

nworth · Jun 13, 2006

It varies somewhat depending on the phosphor, the mercury pressure, and the glass, but generally there is really significant light from about 310 nm to about 500 nm. The peak is around 350 or 360 nm, and glass and gelatin absorb most of the light shorter than about 345 nm. The bulbs match the spectral sensitivity of Azo paper pretty closely, except that they extend more into the green.

Joe Lipka · Jun 13, 2006

Sandy King did a lot of research on this. Results I think were published at Ed Buffaloe's Unblinking eye web site.

waynecrider · Jun 13, 2006

For anyone who cares to read Sandy King's article: http://unblinkingeye.com/Articles/Light/light.html

waynecrider · Jun 14, 2006

nworth said:
It varies somewhat depending on the phosphor, the mercury pressure, and the glass, but generally there is really significant light from about 310 nm to about 500 nm. The peak is around 350 or 360 nm, and glass and gelatin absorb most of the light shorter than about 345 nm. The bulbs match the spectral sensitivity of Azo paper pretty closely, except that they extend more into the green.

So a 351nm bulb in a Graflarger would be a optimum light source for Azo contact printing. Funny that Aristo would offer such a bulb for a Graflarger?

Besides the UV bulb, they have other Graflarger bulb options if anyone is interested.

UV nanometer

waynecrider

nworth

Joe Lipka

waynecrider

waynecrider

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