Patent ID: 8388179

Claim:
A lamp comprising, a bearing member, a first reflector and a second reflector mounted for rotation dependent from said bearing member in a concentric relationship but at non-coincident radii to each other about an axis, said first reflector rotatable, by actuation, in a first direction of rotation and a second direction of rotation opposite to said first direction of rotation about said axis, a light source mounting to mount a light source inward of said radii, to allow said first and second reflectors to rotate at least in part about said light source, said first reflector and second reflector each including an opening to allow radially projecting light from said light source to pass through, the opening of said first reflector positionable to be, at least in part, contiguous the opening of said second reflector to thereby define an aperture for light from said light source to project radially out from said lamp, a rotation limiter operative between said first reflector and said second reflector that (a) in said first direction of rotation of said first reflector prevents relative rotation between said first reflector and said second reflector to allow said first and second reflectors to be rotated at the same rotational velocity about said axis to thereby change the rotational orientation of said aperture, and (b) in said second direction of rotation of said first reflector does not prevent relative rotation between said first reflector and second reflector to allow said first and said second reflector to move relative each other at different rotational velocities about said axis to thereby change said aperture size.