No information can be found on this company now. Aristogrid Products
sell cold-light heads for practically any enlarger. Also stock a platinum printer with specially designed tube.
35 Lumber Road, Roslyn, NY 11576, USA
Phone: +1 516 484-6141
Ship: Locally
Aristogrid’s website comes up on a redirect page. I can’t find any information about it, save from a photrio post about voltarc possibly making new tubes. And voltarc comes up with a redirect page.