We like to test the functionality of a high current power supply by simple power load. It is 12V lamp 50 watts. But it had a high temperature. Require a docking station proper on long time trials.
We use Incandescent motorcycle head light bulbs 12V 25W/25W without a head light socket
The structure inside light bulb has two filaments for the high beam and low beam filaments are soldered two parallel, it would have a combined 50 watts as Figure 3.
It is technically simple electronic If you are experiencing similar problems. Get lucky.