Defenitely not 12 Volts.
I measured the voltage and came to approx 4 Volts.
Tried 6 volts bulbs but they were too dim.
Then tried 3,6 Volt bulbs (those very small ones with 2 little wires attached) and theu burn perfectly. Replaced all 12 bulbs (soldered them straight on) and my display is 100% bright. I am very happy!
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