Best flashlight donor that can take 4x5050 and resist heat

Hello, i looking for something that without big modification can take 4x5050 , driver can output about 3A per one led, so 12A total , can handle heat, and its powered from multiple 18650. i just want reflow my own diodes in place of original. one of my led are about 2,8-3A and fv about 3,4-3,8V. it exist some cheap flashlight like sofirn or convoy or other cheap brands? driver must be able to deliver power and host must be able to dissipate heat.