Different DTHs work in different ways. The official integration only recognizes the bulbs. But There is a custom one that allows you to have the motion sensor still connected to the hue bridge.
I could not resist it, I acquired a Hue motion sensor and a dimmer switch, already had some TAP´s. I wanted to put the house in night mode when the TAP was pressed late in the evening, so the TAP had to be visible in ST as a device.
The problem with the Hue API is that it does not provide events to the outside world. So it had to be a poll implementation, not a good idea to have the hue bridge polled every second (well the Hue bridge might not be bothered) but the ST cloud will be. But polling faster for a shorter period of time might deliver a more responsive Hue Sensor for ST, as i had ST motion sensors in lots of places I got the idea that the probability of someone pressing a button on a hue sensor is higher when there is motion going on in it´s neighbourhood.
So it has two parallel …