Abstract: An LED lamp for lighting purpose includes a lamp base, a heat sink, a plurality of LED modules and a blower. The lamp base encloses an inner space and defines a plurality of vents therein. The vents communicate the inner space with a surrounding atmosphere. The heat sink comprises a cylinder at a center thereof. The cylinder has a through hole therein, which communicates with the inner space and vents of the lamp base and cooperates therewith to form an air passage. The LED modules are attached to a periphery of the heat sink. The blower generates an airflow circulating through the air passage to thereby dissipate heat generated by the LED modules.

Abstract: An LED lamp for lighting purpose includes a lamp base, a heat sink, a plurality of LED modules and a blower. The lamp base encloses an inner space and defines a plurality of vents therein. The vents communicate the inner space with a surrounding atmosphere. The heat sink comprises a cylinder at a centre thereof. The cylinder has a through hole therein, which communicates with the inner space and vents of the lamp base and cooperates therewith to form an air passage. The LED modules are attached to a periphery of the heat sink. The blower generates an airflow circulating through the air passage to thereby dissipate heat generated by the LED modules.

Abstract: An LED luminaire includes an array of LEDs, a multiple-to-one contractor, a pickup optical element, and a light sensor. The array of LEDs has at least one LED in each of a plurality of colors so as to generate a combined light output. The multiple-to-one contractor is positioned to direct the combined light output to a target light guide. A pickup optical element is positioned to extract a portion of the light output from the multiple-to-one contractor. The light sensor is positioned to measure at least a portion of the extracted light so as to adjust the light output of the LEDs.