One of the innovations with our new Joker2 is the ability to convert your HMI to a traditional tungsten fixture. Our 1K Tungsten Back is compatible with your Joker2 800. Simply remove the two screws on the rear of your Joker 800 and replace the rear cap with our 1K Tungsten Back. One quick lamp swap and your Joker 800 is now a Joker 1K. Great for use with Kurves or any time your set is tungsten balanced.