Abstract
The evolution of lighting devices based on light-emitting diodes (LEDs) leads to increase of energy efficiency of such devices and, as a partial case, increase of light efficiency of LED optics. The conventional LED optics with the only freeform refractive surface cannot provide high light efficiency for street- and road-illumination applications. The reason is the performance limitations of the refractive surface in terms of ray rotation. Exploiting the total internal reflection effect, we devised a novel design of LED optics allowing to reach the value of light efficiency up to 80%-90%. This paper details the work principle of our LED optics design and the methods of its surfaces computation. The simulation results show that the proposed LED secondary optics design provides light efficiency by 15.5% more than the conventional LED optics in the case of uniformly illuminated region with size of 40 meters by 8 meters. The usage of the proposed novel LED optics design makes possible to reduce the number of LED chips that are used in modern road lamps and, as a consequence, to reduce the power consumption of road lamps. Still, such optical elements have to be made and tested with real LED sources.
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