Scientific Results

LED streetlamp only with reflection optics

Year: 2015

Authors: Jafrancesco D., Mercatelli L., Sansoni P., Fontani D., Francini F.

Autors Affiliation: CNR-INO, National Institute of Optics, Largo E. Fermi, 6, Firenze, 50125, Italy

Abstract: Outdoor lighting and traffic signaling are emerging fields of application for the Light Emitting Diode technology. These sustainable power-saving illumination sources can be used thanks to the availability of high-power white LEDs that, combined with suitable lenses, permit to obtain various angular distributions of the light for many applications. The proposed LED lamp for street lighting produces high illuminance uniformity utilizing only reflective components, avoiding free-form optics: the luminous flux generated by the LEDs illuminates the roadway both directly and reflecting on the inner surface of reflectors with double curvature. It allows preventing the employment of plastic lenses, subjected to risks of yellowing and decrease of transparency. The results in terms of simulated illuminance on the road show high values of uniformity. Moreover, the optical modelling was aimed to design a configuration actually feasible from a technical point of view.

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KeyWords: Light; Lighting; Photonics; Plastic lenses; Reflection, High power white LED; Illumination sources; Optical modelling; Reflection optics; Reflective optics; Streetlamp; Sustainable power; Traffic signaling, Light emitting diodes
DOI: 10.1049/cp.2015.0161

Citations: 1
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