I bought a set a week ago: Bridge is 2nd generation. I can't find any information about the white bulbs on the net (coloured ones are). If you tell me how I can tell, I'll look it up.

Yes, it works, the lights go out when I say "Good Night"!

Yes, according to my own research it works :)

Please enter a warranty claim and follow the appropriate instructions: https://www.galaxus.ch/de/ReturnsAndWarranty

Yes, Philips Hue is compatible with Alexa.

If you mean the 3rd Gen lamps from Hue, yes, they are compatible.

Connect, screw in, switch on, control via app. The light switch should of course remain on if you want to control it via the app. When you switch it off via the app, the lamp is in standby mode, so to speak.

The Bridge is 2nd Gen (latest for bridge). I am not sure about the two white bulbs though but there should be very little difference between 2nd and 3rd white bulbs. This link helps. http://www.howtogeek.com/255141/whats-the-difference-between-1st-and-2nd-generation-philips-hue-bulbs/