Head-mounted LED light with integrated, adjustable iris

A head-mountable light with an adjustable spot size, comprising:

• a housing having a front opening, a rear portion, and an interior;
• a power cord having a first end connectable to a source of electrical power, and a second end that extends through the rear portion of the housing and into the interior of the housing;
• a light-emitting diode (LED) positioned within the interior of the housing and connected to the power cord to emit light along an optical axis out the front opening of the housing;
• a plurality of beam-forming optical elements coupled to the front opening of the housing on the optical axis, the beam-forming optical elements being operative to form a spot of light from the LED having a spot size at a working distance from the housing;
• an adjustable iris disposed in the interior of the housing between the LED and the beam forming optical elements, the adjustable iris including a variable-sized aperture centered on the optical axis;
• wherein light from the LED strikes the adjustable iris directly with no optical elements disposed between the LED and the adjustable iris;
• and
• a manually operated control accessible on the exterior of the housing enabling a user to adjust the iris and vary the size of the aperture and the spot size of the light at the working distance.