The video tests a powerful DC-DC boost converter, if you believe the sellers at the output can get up to 50 volts and up to 8A at a power of 250 watts!
It is interesting in that it has the ability to adjust the maximum output current. This makes it an ideal driver for high-power LEDs.
http://ali.pub/1x1cpd DC-DC converter from dough.
http://ali.pub/1x1exv slightly cheaper.
http://ali.pub/1x1e78 other modification.
http://ali.pub/1x1f9j stock of shunts