The 2K Tungsten Back from K 5600 Lighting is compatible with the Joker2 1600. Simply remove the two screws on the rear of the Joker 1600 and replace the rear cap with the 2K Tungsten Back. One quick lamp swap and the Joker 1600 is now a Joker 2K. One of the innovations with the Joker2 is the ability to convert your HMI to a traditional tungsten fixture.