OSRAM DULUX F - Manual (Page 72)

Economical long-life light sources with plug-in bases
Compact Fluorescent Lamps OSRAM DULUX ®
Technical Guide
70
heating but also sputter material from the electrode, which causes destruction and therefore
reduction of electrode and lamp life.
It has to be mentioned that the reaction for the formation of Ba on the emitter surface as shown
above needs to take place right at the beginning of lamp operation, i.e. in the first 100h. Once the
lamp has been operated some time in a dimmed mode without the 100h burn-in period, the reaction
will not happen in a proper way anymore, because the structure of the W – BaO interface on the
surface of the electrode under the emitter coating has changed.