[Brian Miller]

I also use a light integrator and a modified photo cell to keep exposures consistent. That became required because my wife would be doing laundry in the room next door and every time the dryer was turned on or off, the light would dim or brighten from the line voltage changes enough to have a big effect on the print values.

There is also the option of using a conditioning power supply for a computer. I have been using a TrippLite backup/filtering/conditioning supply for over a decade. The voltage coming out is regulated by continuously switching between transformer taps. As the voltage fluctuates, I hear the relays clicking. It takes quite a voltage jump for it to switch over to the battery backup.