US Patent 10439611 Sterile handle control mechanism

A surgical light including a light housing having at least one light source therein and a handle assembly extending from the light housing, with the handle assembly including a knob and a cover. The handle assembly is rotatably connected to the light housing. The cover covers the knob. Engaging the cover in a first mode and rotating the knob alters a first characteristic of light emitted from the at least one light source. Engaging the cover in a second mode and rotating the knob alters a second characteristic of light emitted from the at least one light source.