From: Monnoyer Philippe (monnoyer@imec.be)
Date: 07/15/02-03:12:01 AM Z
When we talk about Metal Halide Lamps, we should mention the kind of Metal.
A gallium Lamp will not have the same exposure time as an Iron lamp. You can see the difference in spectrum for example by choosing the link MH-Lamps on http://www.sadechaf.be/sadeen/saden6fr.htm
With the iron based processes, we need the maximum of power approximately between 350 and 400 nm if I remember correctly, because the sensitivity peak of iron salts like AFO or citrate is there.
The iron based lamp seems very good for that but the gallium based lamp will probably request hours of exposure time.
We have to choose the right UV. Easy to remember: Iron process = Iron MH lamp. (I think I'll buy one, test and let you know)
For dichromated colloids like gum or gelatin, I don't know where is the sensitivity peak in wavelength, any idea ?
Philippe
Belgium
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