I use the Gold/thiocyanate toner for Salt and Kallitype prints. It's the same recipe as what B&S sells:
A: 500ml Ammonium Thiocyanate solution 2%
B: 500ml Gold Chloride solution 0.2%
I buy the chemicals from ArtCraft and make the stock solution myself. To make a working solution, you add 5ml of EACH Part A and Part B per 100ml of working solution. (For toning an 8X10 image on 11X14 paper, 100 ml of working solution is sufficient, but you must use a flat bottomed tray to make that small volume work.)
For printing in the summer, I work with sunlight (shade, facing open north sky), but in the winter I use a bank of LED lights, so what you have in mind should work just fine. You will have to experiment with distance and exposure times to determine what is correct for your equipment. Do test strips to start with.
VERY IMPORTANT: as Koraks has said, you need to engineer your negatives to have extra contrast and high value density to work for Salted Paper printmaking. I highly recommend that you read
Ellie Young's paper on Salted Paper printmaking, as it specifically - and in great detail - addresses the proper technique for making an in-camera negative with the right density and contrast for the process.