Viessmann website has an English version. http://www.viessmann-modell.com/en/aktuell/inhalt.php
The replacement bulb for your lamo is "T3/4, diameter: 2.3 mm, 16 V, 30 mA, no wires", so I would say it doesn't need a resistor.
The replacement bulb for your lamo is "T3/4, diameter: 2.3 mm, 16 V, 30 mA, no wires", so I would say it doesn't need a resistor.