I'm using a Philips facial tanning unit that uses six UV tubes 18 inches
long. The unit has a built-in timer and will cover prints up to about 11 x
14 inches. I picked it up at a car boot sale for the princely sum of £10
(about $16). Exposure times for salt prints are around 12 - 15 minutes,
which is about the same as I use to skylight in the summer. These times
should be about the same for kallitypes and cyanotypes, I would think.. And
I reckon around 5 minutes for gum bichromates.
Derek