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 66mm in diameter. The ring light fits ZEISS stereo microscope objectives. The system includes the MC-LS LED light source and a ring light.Ring light specifications-Objective diameter range- 66mmWorking distance range- 38 to 152 mm (1.5in to 6in)Length of connection to box- 838mm (33in)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 (6.2in x 5.7in x 3.9in), 2kg (4.62 lb)Certifications- ETL Approved, RoHS compliant.Warranty- 2 years