is my in law smart sucking power when off?

[plainSw33t]

I'm just getting into smart home stuff, and my in law got these Linkind WiFi bulbs.
I noticed something weird, the base of the bulb feels warm even when the light is completely off
Is there a general rule of thumb for how much energy these WiFi bulbs consume when they're off but still connected to the network? Are they silently sucking the energy like vampires?

 

[BossJoy]

I noticed the same thing with smart bulbs around our place. They stay slightly warm because they’re always connected. The energy use is usually very small though, way less than leaving a regular bulb on. It surprised me at first too.