This SCHOTT ColdVision CV-LS LED Light Source with a ring light is designed for use in stereo microscopy and can be used with microscope objectives between 38 and 53mm in diameter. The ring light fits Navitar and DHRM microscope objectives. The system includes the CV-LS LED light source and a midi ring light.Ring light specifications-Objective diameter range- 38 to 53mmInner diameter- 53.1mm (2.09in)Outer diameter- 58.7mm (2.31in)Working distance range- 13 to 38 mm (0.5in to 1.5in)Length of connection to box- 1016mm (40in)CV-LS Specifications-Color Temperature- 6000K cool white.Luminous Flux- Up to 13502 lm light flux.Max Active Light Guide Ø- 13mmVoltage- 100-240VLight Box- Continuous dimming, fan cooling, ESD Immunity.Analog and Digital Remote Control- USB, RS-232, Dual Ethernet.Light Box Dimensions / Weight- 129mm x 201mm x 59.7mm (5.08in x 7.93in x 2.35in), 0.816kg (1.8 lb)Certifications- CEWarranty- 2 years