LED FRESNEL LIGHTING INSTRUMENT

摘要

A Fresnel lighting instrument for use in film and video production, having a LED light engine mounted to a heat sink defining a first plane, a dual basket type focusing assembly adapted to longitudinally extend or retract a Fresnel lens away from and back to the first plane substantially without rotation along the longitudinal range of extension, to provide a fanless, cool operating, highly compact and lightweight Fresnel light suitable for studio or field use. The dual basket type design allows for transporting three Fresnel units in a standard milk crate since the unit collapses down whereas existing Fresnel lights all use a constant volume can-shaped housing within which the light source is repositioned.

主权项

1. A method of illuminating a subject of a film or video production with a light instrument, the method comprising:
(a) providing said light instrument having a Fresnel lens, an LED light engine mounted to a heat sink, and a focusing assembly interconnecting the Fresnel lens and the heat sink having the LED light engine mounted thereon, a length dimension of the light instrument being substantially a longitudinal length of the focusing assembly or the distance between the outward end of the Fresnel lens to the rearward end of the heat sink; (b) energizing the LED light engine to project a beam of light from the Fresnel lens; and (c) increasing the length of the light instrument to vary the light beam projected from the light instrument from a flood to a spot beam by extending a length of the focusing assembly, wherein extending the length of the focusing assembly includes moving the lens away from the LED light engine thereby narrowing the light beam projected from the Fresnel lens.