Someday I will buy a Heiland source for one of my Beseler 4x5 chassis' The only way to know for sure. I'm not ambitious enough to try and build one. I haven't had good luck with the cheapo, China made medium base LED "bulbs" I had one literally pop, the other day. I thought one of my cats had destroyed something, I came to find plastic pieces in a bathroom sink and wires, from the bulb, hanging from the fixture. Never seen that before.