Not sure if still used, but Beryllium was used in Fluorescent Tanning Lamps (FO72-T12 VHO types).

The Lamps had "Beryllium" labeled with the Manufacturers' information + Lamp / ANSI Identification.

This was "Back-In-The-Day" (1990, 1991), when I did some Tanning Salon Tenant Improvements.

Glad none of the Lamps broke on me! (AKA: "Ohhhh,,,Wooaaaahhh!!...CRASHHHHH... assorted swear words follow crash).
Had no idea of the risk back then!!!
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Scott35

Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!