There is the 4th gen, but it has not changed technically from the 3rd gen. There was only a weight adjustment. Here are the differences -> http://www.netzfieber.de/smarthome....
Version 3.5 does not exist.

I received my Starterset on 03.03.2018 . The text on the bulbs states 9.5 W and each bulb weights about 72 g. As far as I understand, those are both unique features of 4th generation bulbs.

according to my information, there is a 4th generation. are we talking about the 3rd or 4th generation for this product? thanks for the answer.

the kit is gen 3, as the bride supports apple homekit. this was not yet possible with gen 2. gen 4 (or even 3.5) is definitely not available.

I found an explanation on the page

https://www.smartlights.de/licht...

They are lighter and the colour is displayed better.

Is there any answer for this yet?

Is it works with Alexa echo spot ?

Is next to it.

The one I bought has version 3.5.