UNITRON LED580 ring Illuminator, 66mm I.D., 80 LED lights divided into an inner and outer ring. Each ring contains 4 segments of light, each of which can be turned on/off or varied by the external control box, Color temperature 6500K, Produces 5800 foot candles at 4.5" working distance.
 
Optional Polarizing Attachment removes reflections from highly reflective surfaces. $308