A track light assembly adopted for a track light has a conduction track having two lateral sidewalls opposing each other, two lateral retaining members extending inwardly from the two lateral sidewalls respectively, a cavity formed between the two lateral sidewalls, and a cutout formed between the two lateral retaining member and communicating with the cavity. The membrane microstructure device includes a first glass, ceramic or glass-ceramic plate defining a first recess, a second glass, ceramic or glass-ceramic plate defining a second recess, and a non-metallic porous membrane sandwiched between the first and second plates. An elastically resilient member connecting the occupant support member to the frame permits occupant induced rocking motion of the occupant support member with respect to the support surface. Prior to complete thermal decomposition of the feedstock, the direction of vapor flow within the feedstock is reversed wherein the vapor flows upwardly through the feedstock while the volatile compounds are discharged from an upper portion of the chamber.