There isn't going to be any remotely resembling a dimmable LED replacement. Oslolens was speaking about replacing the entire head with a bank of dimmable (?) LED's, a " "skateboard" both geometrically and qualitatively. I'm well aware of various experiments to make and market LED VC heads. I cheer Heiland on, but that's quite an expensive option when a footswitch to on/off the 220V fan, if it's split off onto its own circuit, costs around $20. The actual Durst head is shutter-equipped, so that it trims off both the warm-up and afterglow of the bulb, allowing very precise exposure, and yes, for color work especially. That could be done with an ordinary enlarger by using an enlarger lens with its own leaf shutter with an electronic release synched to the enlarger timer. Extra heat is nice in the winter, bad in the summer.