This SCHOTT EasyLED ring light plus delivers homogeneous and shadow-free illumination and mounts directly onto a stereo microscope objective. The light has eight controllable segments and is cooled by convection.Inside Diameter- 66mm (2.60inch)Outside Diameter- 114mm (4.49inch)Height- 29mm (1.14inch)Working Distance- 50mm-130mm (1.97inch - 5.12inch)Color Temperature- 5600KMaximum Light Intensity- 140 lx, at a working distance of 65mm.Voltage- 100~240V, 50-60HzWeight- 0.6kg (1.3lb)Certifications- CE, UL, PSE, UKCA