If you do not have the very hard and almost impossible to find original bulb lamp for a 138, this might be a valuable alternative (see attachment, the 3 th. picture), considering that your Durst has the right bulb holder.
The bulb you then need is something like an OSRAM CONCENTRA R 125 of 150 watt, do not use a heavier one, like a 250 Watt or the PAR model, it might blow the heat absorbing filter.
Dismount the lamp head like Matti said, do not touch the spring loaded lamp head mounting system, it might hurt you, I am NOT kidding!
Good luck,
Philippe
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