This bulb is not rated for use in an enclosed fixture
Hi there - this bulb can be used without the Hue Bridge using a bluetooth connection. For more detailed info, please see the "How do Bluetooth lights work?" on the page linked here https://www.philips-hue.com/en-us/explore-hue/blog/bluetooth-led-lights
One bulb. Well worth the money. Have 6 in cathedral ceiling. No issues (except my internet connection) and have had 2 years. Adding more downstairs. Love them.
Yes, just change them 1 by 1 on creating a group/ room.
No, it is not recommended to be installed outside.
You don't have to use the Hub for simple commands if you have Google Home or Alexa. Simple commands like on/off and Dimming. As far as I know; more advanced features like creating scenes and changing the color temperature require the Hub and associated app. Hope this helps.. John..
Yes, they do.