Clear mercury vapor lamps are essentially absent in the Brazilian market. They never took off around here.
However, I was looking for one to add to my collection and found this.

A clear 400W mercury lamp in ED37 shape  with this "HQA" naming.
The seller says its a UV lamp for Silk-Screening and other similar uses.

I thought "HQA" was only OSRAM'S name for their clear MV lamps.

Uploaded a picture of the "MercadoLivre" ad for the lamp.

Osram's line of HPMV lamps is HQL, not HQA which probably just refers to the fact it's an uncoated lamp.
See: https://www.lamptech.co.uk/Spec%20Sheets/D%20MB%20Osram%20HQA125.htm

HQA is without phosphor and HQL is with phosphor.