LED-based luminaires for large-scale architectural illumination

摘要

Disclosed herein are exterior architectural fixtures employing LED-based light sources that are capable of projecting light over long distances and providing a wide variety of lighting effects with high lumen output. These lighting fixtures have improved heat dissipation properties and are particularly suitable for large-scale façade washing and for illuminating large architectural structures, such as skyscrapers, casinos, and retail establishments, integrating efficient and compact power supply and control components for driving high-intensity LEDs to achieve a vast variety of lighting effects on a large scale.

主权项

1. A lighting system for illuminating a target object disposed within a predetermined range from the lighting system with visible radiation including at least one of first radiation and second radiation, the system comprising:
a first lighting unit and a second lighting unit fixedly disposed within a lighting fixture of the lighting system defining a singular exhaust gap therebetween, at least one of the first lighting unit and the second lighting unit comprising a plurality of first LED light sources generating the first radiation having a first spectrum and a plurality of second LED light sources generating the second radiation having a second spectrum different than the first spectrum; a first heat dissipating structure thermally connected to a rear surface of the first lighting unit and a second heat dissipating structure thermally connected to a rear surface of the second lighting unit, the first and the second heat dissipating structures configured for dissipating heat generated by the first lighting unit and the second lighting unit, respectively, at least one controller disposed in a controller housing of the lighting fixture and coupled at least to the plurality of first LED light sources and the plurality of second LED light sources and configured to independently control at least a first intensity of the first radiation and a second intensity of the second radiation so as to controllably vary at least an overall perceivable color or color temperature of the visible radiation generated by the lighting system, the controller housing at least partially interposed between the first heat dissipating structure and the second heat dissipating structure and defining a first cool air entry gap between the first heat dissipating structure and the controller housing and a second cool air entry gap between the second heat dissipating structure and the controller housing, the first heat dissipating structure having a plurality of cooling fins directing ambient air substantially transverse to an air flow path of the first cool air entry gap and allowing the directed ambient air around the first heat dissipating structure to one or more of the first cool air entry gap or the exhaust gap; the second heat dissipating structure having a plurality of cooling fins directing ambient air substantially transverse to an air flow path of the second cool air entry gap and allowing the directed ambient air around the second heat dissipating structure to one or more of the second cool air entry or the exhaust gap, the first cool air entry gap and second cool air entry gap joining to form the exhaust gap and forming an unobstructed path for enabling a flow of ambient air through the lighting fixture, thereby facilitating dissipation of heat generated by the first lighting unit and the second lighting unit.