Power consumption of a Fluorescent choke
It's hard to find actual usable data on the ballast you posted.

Wikipedia suggests that for reactive ballasts (like the one you used) the wasted power is in the order of 5-25% of the rated wattage of the lamp.

A paper from General Electric: Fluorescent Lamps Technical Bulletin TP 111R is cited to state that the loss of the ballast is around 10% of the lamps input power (dated 1978, haven't found a digital copy).

So the numbers I found do not support your claim of nearly 100% losses of the rated power in the ballast (have you got a source for that?).

In your case that would be between 7.2 W to 36 W, with a small emphasis on 16 W because of the cited paper. Total power:  151,2 W to 180 W (160 W emphasis)

In a not compensated ballast the power factor will be very bad. On the label you have a lambda given with 0.48 to 0.52. So you can get a VA rating (apparent power) which is double of the lamps W rating (active power), but that's not what you pay for usually.