You can find an LED tower available from Lumens Factory but its not the same as an MD60. The LF version is XPG while the Malkoff is XML. Do a search function here on CPF and you will see a pretty recent thread about this.
LF has the replacement heads as well as the LED towers. The towers replace the incan bull but IMO it is maybe 1/2 as bright as the replacement head. If you're into the incandescent tint, the NW version of the head is a very nice warm tint.