The give-away is here.....
http://www.lutec.com.au/how.htm
The input is pulsed by a rotating switch (commutated) allowing the DC input
current to flow through the motor coils for a percentage of one cycle as
dictated by the actual ON period of the commutator contacts. In most cases this
is around 0.2 of a cycle.
What the crest factor of that ?
Also they claim the output is in watts when it's actually volt-amperes (
apparent power ).
Graham