Sounds like you have one of the "Tunable White" bulbs and Not a "Philips Color" bulb.
I changed led bulb for led bulb so no change in electricity cost. But if you switch from incandescent or fluorescent bulbs you will save money. Also, I switched my incandescent bulbs (which burned out 3 times a year) to led bulbs 3 years ago and they are still going strong. Well worth the expense.
Yes and they work great. Just make sure they fit if you have glass globes or shades over the bulbs.
The question proceeds from a false assumption, there is no need for a dedicated 2,4GHz WiFi network. A home WiFi network is not partitioned, and WiFi Smart bulbs don’t appreciably degrade network performance. If 5Ghz and 2.4 GHz WiFi is desired all that’s needed is a dual band band router. I have a peculiar building so I have both a dual band router and a dual band access point (the access point uses cat 6 to the router). There are at least 3 sets of channels in each band that don’t overlap. I have several 2,4GHz only WiFi smart devices. There’s no problem sending network traffic to them. Yes, the messages pass through the either the access point or the router or both as “store and forward” traffic, but that doesn’t slow anything down. The WiFi traffic to/from a smart bulb is probably at a lower data rate, but aside from a firmware update the message packets are small and infrequent so it doesn’t matter. If there were devices that dragged down network throughout its possible to use an access point on a non-conflicting channel(s) and use that SSID for the slow devices, The only potential cause for concern is the number of DHCP addresses available for auto-assignment in a home network is around 240. It’s plausible for a home to have enough smart devices to approach that limit and want a better router that can assign a larger DHCP address range at some point. At this point routers that can do that aren’t really consumer friendly. A viable consumer strategy would be to cascade a main router using say the 192.168.0.xxx addresses and downstream router for 192,168.1.xxx and so on.
This bulb is not rated for use in applications where it will be exposed to water or in use in enclosed fixtures. In order to communicate with your local wi-fi network, the bulb will need to be installed in a location where it will have a strong wi-fi signal.
These bulbs are not compatible with Apple HomeKit. They are compatible with Siri Shortcuts, however.
Yes - This bulb will allow you to choose from thousands of colors and shades of white using the WiZ app.
The Philips WiZ connected bulbs are not compatible with the Philips Hue line of connected bulbs. These Philips WiZ bulbs connect directly to your in home Wi-Fi and do not utilize a hub or bridge