The heat dissipation conditions of high-power 5 watt LEDs-based searchlight modules were optimized with varying LED bar’shape, materials, and ambient temperature. The LED junction temperature was estimated by using Computational Fluid Dynamics simulation. The optimal heat dissipation conditions were found as follows; LED bar’ shape: L=80 mm, W=4 mm, t=10 mm, copper material, LED junction temperature of 116.6℃, ambient temperature of 50℃, total mass of 184 g, and shadowing area of 320 mm2. The difference between the junction temperatures of our fabricated and simulated LEDs-based searchlight modules is about 3℃, which confirms the validity of our thermal simulation results.