It's time again: From 18-23 March the Light + Building 2018 opens its doors in Frankfurt am Main. More than 210.000 visitors are expected to the world's leading fair for lighting and building services. Inspiring new ideas related to lighting and lighting components are presented on our booth featuring glass optics for RGBW, High-Power LEDs, and Laser applications as well as optical coatings on plastics. Come and see us, our team of experts is looking forward to your visit!
“Washing” a wall with light is kind of an art and is often used for atmospheric illumination and stunning effects. Now, it’s becoming easier with the help of Auer’s tailored lens design. First: what does “wall washing” mean? On many occasions lighting designers or interior specialists like to illuminate walls with a uniform light distribution, sometimes in lateral and height, sometimes only in one dimension. Since local conditions often offer limited space lighting fixtures have to be mounted in close vicinity to the wall. This results in extreme angular requirements. As an example, if a fixture is placed on the ceiling, at a distance of 0.5 m to a wall of 3 m height, it has to be tilted down. Doing so with a typical spot light would however result in an non-symmetrically illuminated surface of the wall. So, more efforts have to be put into the optical design. This allows for illuminated areas on the wall that show nice brightness homogeneity. In a recent project with one of our customers, Auer had the task to design an optical solution that was able to illuminate a 3 m high wall from a distance of 90 cm. A usual spot would have looked like this:
We used our own, GPU-driven optimization algorithms to derive a better solution for this task. The result is a lens of 20 · 20 mm2 size that is placed in front of a small LED with 1.5 mm die size. The non-rotationally symmetric light distribution is achieved with a freeform lens. The faceted front structure enables both a highly controlled light emission and also a smoothing of the resulting illuminance distribution. The stackable design allows for the mounting of arrays of optics to obtain the overall brightness level as desired. As a result, a beautiful and homogenous light intensity distribution with an overall efficiency of about 70 % is obtained.
Of course also non-square light distributions with non-homogenous illuminance can be tailored according to your requirements. Interested in details? Please feel free to visit our talk at the SPIE Optical Systems Design (Talk 10693-7: https://spie.org/EOD/conferencedetails/illumination-optics).