Geometric and thermal design for a new concentrator-collimator lighting system based on LED technology

Abstract

A new concentrator-collimator lighting system based on light-emitting diode (LED) technology is presented. Using an array of LEDs as source, by means of a three-dimensional concentrator and a parabolic collimator, this device makes it possible to obtain an integrated light beam with a high intensity level and the desired divergence, in a compact geometry with small output area. It offers low consumption and a long lifetime. An optical model allowing control of the beam parameters is presented together with a design for thermal stabilization of the device. These characteristics make it applicable in a variety of fields where high luminous intensity, quasi-monochromatic light and narrow angular distributions are needed, among them road signalization. To improve the colour rendering it would be necessary to use a white LED or three different LEDs in an array.