Minor nit: He said the first one ("low beam") is the taxi light, and
then the landing light is "high beam". So, it would be turning the
taxi light on first, then the landing light on (and taxi stays).

"Low" beam may be a poor way to state it. It may well be the same bulb as the
"high" beam (landing light) (and I haven't actually checked to see). It is just
pointed much lower to the ground in front of the plane.
And yes, the taxi light stays on with the landing light effectively doubling
the load.

Jim