apbphoto
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Kienzle also list the bulbs on their price list though it is possible to get them from various eBay sellers, US bulb specialists and spezilamp.deThe Kienzle parts are a set of machined pieces designed to allow the use of a suitable spec currently available bulb (EFN) - which are essentially identical to Leitz's own upgrades towards the end of the V35's life.
I have just placed an order from what seems to be the last producer of the 13139 type bulb: Donar in China. I ordered through the AliExpress app 5 bulbs for just over USD50 including shipping to U.K. I got the same bulbs from a US seller earlier and they work identically to the Philips ones.
I am intrigued by the Heiland LED but for the price of the setup could easily get a top class enlarger or more than 100 halogen bulbs so remain to be convinced! I read that the image is greenish but if it’s much brighter than the original system I’d be happy. With the VC module the V35 is pretty dim.
Making big enlargements is the main reason I like the V35 but the exposures are typically 3-4 times longer than my IIc. My darkroom roof isn’t high enough to raise the IIc to its full extent alas!