U of S | Mailing List Archive | alt-photo-process-l | Some Lights It Hot, Some Lights It Cold

Some Lights It Hot, Some Lights It Cold

Forgive me the headline, I'm atoning for a life of typos...
Seriously though, I have a real question... I use a bank of UV BL
fluorescents to print my work (a la Eepjon). I've been weeding out the
errors, big and small, in my process lately. I find that when the are hot,
used within the last half hour, they are anywhere from one-third to
two-thirds a stop faster than when the lights are "cold". The difference
makes printing to highlight and calibration (using the term loosely) a real
pain. I know on commercial units there is a sensor which calculates how many
"units" of UV has been emitted so the operator can compensate. Has anyone
built a similar switch for the smaller light boxes?