Question about Fair Basis BT - 331855

I know, someone asked before what the difference is to the more expensive version "Philips Hue Fair Basis" (https://www.galaxus.ch/de/s14/product/philips-hue-fair-basis-wandleuchte-deckenleuchte-5923994). The answer that the cheaper one (Philips Hue Fair Basis BT) is equipped with Bluetooth is somehow not plausible... I mean, of course it's true that BT stands for Bluetooth, but it can't be that the cheaper one is equipped with more functionality than the more expensive one, can it? Even more so, as the BT version can apparently also be controlled via a bridge. So what exactly is the difference? Why should I buy the more expensive one when the cheaper one has more functionality (Bluetooth)? Another difference I see is that they have a different energy class: the BT version has A+, the more expensive one has A++. But that's strange again: the cheaper BT A+ version has 33.5W, while the more expensive A++ version has 39W... This is another contradiction for me: why does the lamp with the better energy efficiency have more watts? Surely it should be the other way round? I hope someone can explain to me in a plausible way what the more expensive lamp can do more than the cheaper one, and why the more expensive lamp with a better energy rating still needs more watts.