I have one of the cold light stabilizers that Horowitz developed with Fred Picker's input and guidance on what was needed. I haven't used it in some time since I no longer use a cold light head. I did find, however, that cold light sources are subject to light stabilization problems that other light sources are somewhat immune to. The cold light stabilizer worked very effectively to solve these fluctuations.
Originally Posted by juan
If one is only doing "one offs" of prints it is unlikely that these fluctuations would be noticeable...Make a couple of dozen of an image and one quickly notices a difficulty in arriving at consistency.
I disagree that Fred Picker was only selling timers. In my opinion,from the Zone VI products that I used, they represented departures from existing methods and products and that these departures represented improvements. As such I still consider them representing good value.