So, when the BNOW fledglings are no lengthier returning to the cavity and it is vacant for a whilst - which is what commonly and finally takes place - I will go up there and put in a new digital camera (the just one that is there is Really previous), In the meantime, the cavity is being partly "lit up" by the infrared LED’s from the PTZ cam, so that’s why you can nonetheless see a very little bit there at night time.