in a lighting apparatus comprising a light source housing is pivoted on a clip that can attach alternatively to a head strap adapter or to an adapter secured to a night vision goggle mounting plate . the clip includes a horizontal member having a bracket on the light source housing is rotatable , a pair of spaced , upwardly extending , tabs , and a vertical member extending upward from a location between the tabs . the upwardly extending tabs enter slots on the bottom of the adapter or mounting base , and a rib on the top of the adapter or mounting base is received by a snap fit in a downwardly facing slot on a horizontal part at the upper end of the vertical member of the clip .