This SCHOTT ColdVision MC-LS LED Light Source with a ring light is designed for use in stereo microscopy and can be used with microscope objectives between 47 and 62 mm in diameter.Ring light specifications-Objective diameter range- 47 to 62 mm (1.9inch to 2.4inch)Working distance range- 38 to 152 mm (1.6inch to 6inch)Length of connection to box- 838 mm (33inch)MC-LS Specifications-Color Temperature- 5400K cool white.Luminous Flux- Up to 8502 lm light flux.Max Active Light Guide Ø- 13mmVoltage- 100-240V, 50/60HzLight Box- Continuous dimming, fan cooling, temperature monitoring for protection of the LED light engine, high resistance to vibration and shock.Analog and Digital Remote Control- USB, RS-232, 9-pin connector.Light Box Dimensions / Weight- 158mm x 145mm x 98mm (6.2inch x 5.7inch x 3.9inch), 2kg (4.62 lb)Certifications- ETL Approved, RoHS compliant.Warranty- 2 years