I already have two Ubiquiti AP AC Lite and wanted to add a 3rd one but there seems to be only the U6 Lite.
Three questions:
1. Which adapter should I use (the AP AC Lite was included in the package) as it has a higher wattage?
2. Would you recommend a POE switch for all three APs?
3. Can this U6 lite be networked with the other two without any problems?

Question

I already have two Ubiquiti AP AC Lite and wanted to add a 3rd one but there seems to be only the U6 Lite. 
Three questions:
1. Which adapter should I use (the AP AC Lite was included in the package) as it has a higher wattage?
2. Would you recommend a POE switch for all three APs?
3. Can this U6 lite be networked with the other two without any problems?

Answer

For 3 or more accesses, I would consider using a POE switch from Unifi. However, there is also the U6-Pro or Mesh. As an adapter, I would always take the one supplied or the one that fits the specifications. However, POE is quite dynamic and can also handle higher power levels, because this is negotiated. With a POE switch, however, you can see and control this granularly.

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Question about Ubiquiti Access Point U6-Lite