Patent ID: 8702279

Claim:
A lighting apparatus comprising: a bulb having an open end and a closed end opposite to said open end; a heat sink unit disposed in an inner space of said bulb, and including an end wall portion and a first sleeve portion, said end wall portion having two opposite first and second surfaces, and being disposed in proximity to said closed end, such that said first surface faces toward said closed end of said bulb and such that said second surface faces toward said open end of said bulb, said first sleeve portion having opposite first and second ends, said first end of said first sleeve portion being disposed adjacent to said end wall portion, said second end of said first sleeve portion being disposed adjacent to said open end of said bulb; a light-emitting unit disposed on said heat sink unit and including: a first circuit board disposed on said first surface of said end wall portion, a second circuit board disposed around said first sleeve portion, and a plurality of light-emitting elements respectively mounted on said first and second circuit boards; a heat insulating unit disposed at least one of a position between said first surface of said end wall portion and said first circuit board, and a position between said first sleeve portion and said second circuit board; an annular seat coupled to said bulb in proximity to said open end; and an electrical connector coupled to said annular seat and adapted for connection to an external power source.