Patent ID: 8931939
Filing Date: 2015-01-13
Classification: F21V,F21W,F21Y,G02B

Abstract:
1. An LED luminaire, in particular an LED headlight, comprising an active light source of multiple LEDs having the same or different colour, said LEDs being arranged on a flat or curved surface or a board, and further comprising an optical system having a collimation optics, individual lenses thereof being arranged next to emission surfaces of the LEDs, the collimation optics collects, focusses and directs light emitted by the LEDs onto a distant plane, a condenser receiving this directed light, and mixing it in terms of colour or brightness, a Fresnel lens being adjustable along an optical axis of the LED luminaire said adjustable Fresnel lens receiving the light emitted by said condenser and emitting said light with a pre-determined light distribution into a far field, wherein the light distribution may be a flood light distribution or a spot light distribution selected by adjusting a distance between the adjustable Fresnel lens and the condenser, said collimation optics comprising on its light entry side cone shaped total reflection lenses, are each arranged directly in front of an LED and are directed thereto, said collimation optics comprising on its light exit side a stepped lens structure according to the type of a Fresnel lens, and said collimation optics directing the light of the LEDs in such a way that it completely fills a light entry area of the condenser.