CraneJay wrote:
So if I buy the light bulb, I would have to buy the light switch too?
No.
I understand the Apple hub and the HomeKit being connected.
The hubs are boxes that maintain state as other devices — iPad and iPhone, for instance — come and go from a particular location.
HomeKit is how these devices can be programmed.
I just didn’t know I needed a light switch now in addition to the lightbulb. Please correct me if I am wrong.
The switch is useful for controlling devices not otherwise networked, and not remotely managed.
The switch is not necessary for the bulbs mentioned above.
You could use a switch to control decorations such as chains of electrical lights, or a grow light for your plants, or the lighting in a fish tank.
I have some boxes that occasionally lose the plot, and the switch is useful for resetting and restarting those boxes remotely.
Wrinkles:
The bulbs do need to be installed in sockets in fixtures that are physically switched on and powered on at all times, as otherwise the bulbs won’t have power for communications and control. This means that a desk lamp must be switched in at all times when remote control (on, dim, off, colors) is needed. The remote control via Home or via automations can turn off the light, but the physical switch in the light fixture needs to remain on.
The bulbs will usually turn on when first powered up, too. This means things can get quite bright during the power restoration after a local power grid power failure.