BEST OVERALL
We'll keep things simple: the Galayou 360 is the best light bulb security camera on the market today.
Why? Well, firstly, it's easy to install. Just screw it into a normal light socket, download the free Wansview Cloud app, and follow the app to connect to your WiFi network. It offers a high-resolution 2K picture. That means you'll get enough image quality detail to recognize faces and other details of anyone up to no good in your home. And it comes with six floodlights and six IR lights, so you'll get clear images even in complete darkness.
It comes with motion-tracking technology, allowing it to automatically detect and track anything in its field of view (it boasts a 355° pan and 65° tilt range). It can send motion detection alerts to your phone. You also get an alarm and white light that you can use to scare away intruders. And it supports 24/7 video recording to an SD card up to 128GB (sold separately). If you prefer, there's a cloud storage service you can subscribe to.
If you wish, you can control the camera with your voice, using Alexa or Google Assistant. And finally, you can use it to talk with anyone in your home, whether that be intruders or more friendly faces such as couriers or babysitters.
In short, this light bulb security camera offers pretty much everything you need, and all at a very affordable price. Note, though, that it's not waterproof, and it only works with 2.4Ghz WiFi: 5Ghz WiFi is not supported.