U of S | Mailing List Archive | alt-photo-process-l | Lightsource for Gum

Lightsource for Gum

Hi everyone!
Thanks for all of your answers on this topic, and sorry for bringing it up once again....
...But just so I get it right from the begining:
-    Wich tubes avalible on the market today will give the the best results? - And is there any tubes that won't? 
-    How many tubes will I need?
-    How far away from the print should the tubes be?
Thanks again