An LED lamp includes a hollow first heat sink, a plurality of LED modules respectively mounted on outer sidewalls of the first heat sink, a second heat sink being enclosed by the first heat sink, and a plurality of heat pipes connecting the second heat sink to the first heat sink. The first DUT is biased such that interface traps are generated during a first mode. The first and the second plate and the frame structure define a cavity filled with air, wherein at least one vent opening is formed in the first andor the second plate andor the frame structure. The third object can be created as a pseudo wall. The pan-supports are pivotable to facilitate compact storage of the hanging roaster.