Lumos has published a revised version of its engravings finder for opticians. With the help of the book, opticians are able to find the engravings that were made on a certain glass and the company that produced the glass. More than 22,000 different glasses are listed in the book. The revised version includes even more manufacturers of glasses than the first version. It is sold to opticians in Germany, Austria and Switzerland. An English version has not yet been planned.