Abstract: A lighting apparatus and system and method for controlled lighting are provided. In one embodiment, a lighting apparatus comprises a heat sink including a center passageway passing from a chimney inlet to a driver circuit housing, a plurality of internal heat sink fins within the center passageway, and a plurality of external heat sink fins adjacent the driver circuit housing. A flow channel is between each set of two adjacent heat sink fins of the plurality of heat sink fins to provide a plurality of internal inlet flow channels and a plurality of external outlet flow channels, with each flow channel aligned with one of a plurality of PCBs, each having an LED mounted thereon.

Abstract: A lighting apparatus and system and method for controlled lighting are provided. In one embodiment, a lighting apparatus comprises a heat sink including a center passageway passing from a chimney inlet to a driver circuit housing, a plurality of internal heat sink fins within the center passageway, and a plurality of external heat sink fins adjacent the driver circuit housing. A flow channel is between each set of two adjacent heat sink fins of the plurality of heat sink fins to provide a plurality of internal inlet flow channels and a plurality of external outlet flow channels, with each flow channel aligned with one of a plurality of PCBs, each having an LED mounted thereon.

Abstract: A lighting system has a heat sink for removing the heat released by LED chips by means of natural convection and thermal radiation. A center opening formed between air and heat sink fins enables the transfer of heat generated by LEDs, electronic driver circuit and phosphor on said heat sink fins to the flowing air inside and removing from the system, and increases the contact surface of heat sink fins with the air that enables to transfer the heat effectively from heat sink fins to flowing air and also with effective radiative heat transfer. The heat sink has a chimney inlet where air enters into said center opening, on which the PCB and said LED package are positioned, and which interconnects LED package and heat sink, which has an optimized structure and base angle, that maximize the heat removal by natural convection and thermal radiation.

Abstract: A lighting system has a heat sink for removing the heat released by LED chips by means of natural convection and thermal radiation. A center opening formed between air and heat sink fins enables the transfer of heat generated by LEDs, electronic driver circuit and phosphor on said heat sink fins to the flowing air inside and removing from the system, and increases the contact surface of heat sink fins with the air that enables to transfer the heat effectively from heat sink fins to flowing air and also with effective radiative heat transfer. The heat sink has a chimney inlet where air enters into said center opening, on which the PCB and said LED package are positioned, and which interconnects LED package and heat sink, which has an optimized structure and base angle, that maximize the heat removal by natural convection and thermal radiation.