A. Garcia-botella et al., Geometric and thermal design for a new concentrator-collimator lighting system based on LED technology, METROLOGIA, 37(5), 2000, pp. 607-610
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 allow
ing control of the beam parameters is presented together with a design for
thermal stabilization of the device. These characteristics make it applicab
le in a variety of fields where high luminous intensity, quasi-monochromati
c light and narrow angular distributions are needed, among them road signal
ization. To improve the colour rendering it would br necessary to use a whi
te LED or three different LEDs in an array.