The objective of this research is to experimentally evaluate the specific impact of a collaborative heat sink composed of Gravity Heat Pipes (HP) and Pulsating Heat Pipes (PHP) on the thermal efficiency of LED light sources. The heat sink developed in this experiment is designed to improve the thermal management system, ensuring that LEDs operate within a safe temperature range, which is crucial as the performance of LEDs is directly affected by their junction temperature. An HP-PHP collaborative heat sink was employed in the experiment, where PHP served as heat dissipating fins to enhance its thermal performance, while HP handles the majority of the heat transfer tasks. The results showed that under forced convection conditions, the HP-PHP collaborative heat sink can increase the maximum thermal power capacity of LEDs to 192W. The HP-PHP collaborative heat sink can reduce the substrate's temperature to below 70.5°C in passive mode when the LED input power does not exceed 96W. Additional experimental results show that the minimum thermal resistance of the collaborative heat sink is 0.19K/W under natural convection conditions; under forced convection conditions, this value drops to 0.15K/W, which still lower than the non-collaborative heat sink. These results demonstrate that the contact thermal resistance between HP and PHP significantly enhances the thermal performance of the collaborative heat sink. Therefore, this collaborative type of heat sink is an effective method for cooling high-power LEDs.