I used my scanner to do all my old family pics, loads of negatives that I had never seen the prints of. I placed the neg down, placed white paper behind it and set the scanner to scan negative to produce the positive. The advantage is no focusing, no alignment problems, and all instantly onto the hard drive. You can adjust the image if required in PS, and if you get a good flow going the lamp will not require to heat up again, just scan one after the other.
Good luck with which ever method you use.
Bob