A lighting apparatus, comprising: a circuit board, comprising: a light source for emitting light; and a power driving circuit, electrically connecting to the light source, wherein the power driving circuit comprises a full-bridge rectification circuit, a π-filter circuit and a non-isolated switch driving circuit electrically connected in sequence, wherein a first output terminal of the non-isolated switch driving circuit is connected to the light source, and wherein the full-bridge rectification circuit, the π-filter circuit and the non-isolated switch driving circuit are common grounded to form a power ground; and a base being a hollow structure and supporting the circuit board, wherein the base comprises a conducting layer made of metal and an outer insulation layer forming an external wall of the base; wherein the power driving circuit is electrically connected to the conducting layer, characterized in that, the power ground is connected to the conducting layer via a metal contact pad of the lighting apparatus, and the conducting layer is an electroplating layer being placed onto an internal wall of the base, wherein the metal contact pad has a first segment and a second segment, wherein the first segment is perpendicular to the second segment, wherein the first segment is electronically connected with the circuit board and the second segment extending from the other end of the first segment and connects to the conducting layer of the base, and wherein the power ground is connected to the first segment. a circuit board, comprising: a light source for emitting light; and a power driving circuit, electrically connecting to the light source, wherein the power driving circuit comprises a full-bridge rectification circuit, a π-filter circuit and a non-isolated switch driving circuit electrically connected in sequence, wherein a first output terminal of the non-isolated switch driving circuit is connected to the light source, and wherein the full-bridge rectification circuit, the π-filter circuit and the non-isolated switch driving circuit are common grounded to form a power ground; and a light source for emitting light; and a power driving circuit, electrically connecting to the light source, wherein the power driving circuit comprises a full-bridge rectification circuit, a π-filter circuit and a non-isolated switch driving circuit electrically connected in sequence, wherein a first output terminal of the non-isolated switch driving circuit is connected to the light source, and wherein the full-bridge rectification circuit, the π-filter circuit and the non-isolated switch driving circuit are common grounded to form a power ground; and a base being a hollow structure and supporting the circuit board, wherein the base comprises a conducting layer made of metal and an outer insulation layer forming an external wall of the base; wherein the power driving circuit is electrically connected to the conducting layer, characterized in that, the power ground is connected to the conducting layer via a metal contact pad of the lighting apparatus, and the conducting layer is an electroplating layer being placed onto an internal wall of the base, wherein the metal contact pad has a first segment and a second segment, wherein the first segment is perpendicular to the second segment, wherein the first segment is electronically connected with the circuit board and the second segment extending from the other end of the first segment and connects to the conducting layer of the base, and wherein the power ground is connected to the first segment.