PETZL DUO Belt Halogen Lamp

Can someone tell me a good halogen lamp( more powerfull than the original) to use with my PETZL DUO Belt, and where to buy it.
Does anyone know the specs of the original lamp?

Thanks
Sérgio Silva

Specs of original halogen bulb: I suspect, but do not know for sure, that the specs are the same as those of an HPR-55 which are 5.2V/0.5A, 48lm, 15hrs rated life. Since the belt Duo uses C-cells which have generally poor high rate performance [I'm talking about primary alkaline cells] I think that you would not be happy with a higher amperage bulb unless you where to use rechargeable cells. You might find the original bulb to be satisfactory with rechargeable cells since that will maintain higher operating voltage than the alkalines.

Thanks for the reply Doug

I think it's HME55 instead of HPR55.

Alan