Thank you all! I see there is a lot to know on this topic as well. The lamp was a P3/3 ES, 220v/75W, like this one:

It looks just like the PH140. Itīs not halogen, is it? Maybe there is a better alternative/version? I could not find anything with lower wattage. If itīs like this I guess Iīll just have to stock-up a pile and especially find a place where to buy them locally.