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This thesis is about Heat-sink design which is considered as the biggest problems for commercialization of LED lighting and suggests how to solve the problems though analysis on heat-sink using COMSOL. The temperature difference after simulation value and modelling was 10℃ by Transient analysis of Heat Transfer Module which is in the COMSOL Multiphysics. The result approximated the object which is close to actual lighting, when various elements are used according to temperature change of interior and exterior surroundings LED lighting is set up.    LED        , COMSOL      . COMSOL Multiphysics  Heat Transfer Module Transient Analysis   ,         10[℃] , Led Lamp   ․                   . Key Words : LED, COMSOL, Heat-sink, MCPCB, CF-d. * Corresponding Author : Ik-Soo Eo(iseo@honam.ac.kr)Received March 24, 2009 Revised (1st June 1, 2009, 2nd June 10, 2009) Accepted July 22, 2009

Analyze on Heat-sink of 20Watt Class LED Lamp using COMSOL