if so, are all revisions of the Fresnel adapter compatible?
Source Four LED Series 3 is compatible with the Fresnel adapter, and there should be no revision restrictions.
Does the Fresnel adapter use HW5508 : 1/4-20 x 7/8 screw with the Series 3, as it does with Series1/2 ?
Both Series 2 and Series 3 use the same hardware to connect the barrel or adapters to the light engine.
