PURPOSE: A lighting device is provided to reflect light irradiated from a light emitting module to the front area of a bulb. CONSTITUTION: A heat sink(110) comprises a mounting block(115) having top surface and multiple side surfaces. A bulb(140) surrounds the mounting block to corresponded to the top surface of the mounting block. A light emitting module(120) comprises a first substrate arranged on the side of the mounting block and an LED light source. A power unit(160) is electrically connected to the light emitting module. A housing(170) accommodates the power unit. A receptacle(180) is electrically connected to the power unit.
