Lighting device

A lighting device comprising:

• a heat sink that comprises a base and a projection, wherein the base comprises a first surface, and wherein the projection extends from the first surface of the base and comprises a second surface;
• a light source that comprises a substrate disposed on the second surface of the projection and a light emitting device disposed on the substrate;
• a driving part that is disposed on the first surface of the base and is electrically connected to the light source;
• and
• a housing that receives the heat sink, the light source and the driving part,
• wherein a second straight line passing through a center of the second surface of the projection is ⅓ to ½ as much as a first straight line passing through a center of the first surface of the base,
• wherein the driving part comprises a circuit board and parts disposed on the circuit board,
• wherein the base of the heat sink comprises a fastening hole,
• wherein the housing comprises a fastener corresponding to the fastening hole of the heat sink, and
• wherein the fastener of the housing is disposed on the circuit board of the driving part and limits movement of the circuit board.

A lighting device comprising:

• a heat sink that comprises a base and a projection extending from the base and having one side;
• a light source that comprises a substrate disposed on the one side of the projection and a light emitting device disposed on the substrate;
• and
• a driving part that is disposed on the base and is electrically connected to the light source,
• wherein the one side of the projection comprises a projecting key,
• wherein the substrate of the light source comprises a hole into which the key is inserted, and
• wherein the one side of the projection is coupled to a screw and comprises a fastening hole disposed adjacent to the key, and wherein both the screw and the key are coupled to the hole of the substrate of the light source.