For your consideration: 

Nikon SR-2 Macro Ring light flash unit and AC Unit LA-1. 

Power supply powers on and indicator shows power is on, but cannot test fully. 

Ringlight is designed for use with Nikkor lenses ranging from 35mm to 200mm. This unit screws into 52mm filter threads on the front of the lens. The ring light connects to its power source with one cable and to the camera-body sync terminal with a sync cord. It has a guide number of 48 feet with ASA 100 film when set for FULL power. A switch on the unit selects 1/4 power and a guide number of 24 feet.

Please feel free to ask any questions.

Thank you!