Our lamps are only compatible with 2.4Ghz WiFi at the moment. 
This is the current standard and has better range. 

Most new 5Ghz routers also have an option for 2.4Ghz WiFi on them, so if you don't see the FriendshipLampXXX WiFi on your phone when trying to connect, you may need to ensure that the 2.4Ghz option is selected on your router.