Most V35s seem to have been converted at some point, and I suspect the OP's current lamp is the Phillips 13139. You can still find them for sale, but they are becoming expensive. I haven't yet considered what to use when they finally run out. I would hate to think that my V35 would become useless. Alex
Yes, it is Philips 13139. Your (ours) focomats will not be useless - just you will expose 2-3 minutes instead of 20s with Osram bulb. That is why I am wondering is there a third option.