One of our most popular accessories, the Bug-A-Beam Adapter allows you to mate your Joker with an ETC Source 4 Ellipsoidal.  For the Joker 400, all you need is the BAB Adapter.  For the Joker 800, you need the BAB Adapter, a modified Source 4 back provided by us, and a lamp pin extension.  And of course, you’ll need an ETC Source 4 Unit, where you’ll remove the provided 750 Incandescent lamp and replace with you Joker.