PURPOSE: A lamp is provided to improve heat dissipation by discharging heat from a light source through the circulation of coolant. CONSTITUTION: A body(110) is partitioned to have two or more installation space units. A light source(120) is installed in the installation space unit and emits light. An expander(131), an evaporator(133), and a compressor(135) are installed on the same installation space unit as the light source to cool heat from the light source through a cooling cycle of condensation, expansion, and compression. A heat exchanger is installed on the body to separate a condenser from the light source.
