This SCHOTT ColdVision CV-LS LED Light Source with a ring light is designed for use with stereo microscopes 47-6 mm in diameter. Ring light specifications-Objective diameter range- 47 to 62 mm (1.9in to 2.4in)Working distance range- 38 to 152 mm (1.6in to 6in)Length of connection to box- 838 mm (33in)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