Patent ID: 8393761
Filing Date: 2013-03-12
Classification: F21K,F21V,F21Y,G02B

Abstract:
1. Lighting device comprising an extended light source, a reflector which encompasses the light source and is in the form of a conical frustum with a wide aperture at the widened end of the reflector and a narrow aperture at a tapered end area at which the light source is arranged with the light being emitted towards the wide aperture of the reflector, wherein surface lines of the reflector intersect at a notional apex, a lens for concentrating the emitted light, wherein the lens is mounted so as to be capable of moving along an optical axis of the lighting device within a predetermined range of movement with a focal point of the lens in the direction of emission being capable of being shifted at least into an area behind the notional apex of the reflector.