The cause of the IP Camera ticking like a metronome is mainly due to the light sensor not being isolated from the light emitted by its nearby IR LED's. The reviewed led ring version (left on the picture) comes with a light sensor wrapped in a black plastic shield and also equipped with a filter.
Fitting:All the actions below are done with the camera un-plugged from power of course. The whole operation won't exceed 15 minutes.
The head of the camera can be simply opened by removing the 4 screws located on the bottom.
It might be tempting to just unsnap the black plastic frame from the white cover with risk of cracking it, so prefer the softer way below:
Next, there are 4 more screws to remove in order to detach the lens board and give way to the LED ring. It's important to keep a note of the lens board position and also of the connectors assignments to avoid re-assembling it all upside down later on. Use the picture below as a guide.
Once the glue points are removed, the LED ring will come free.
Now just fit in the new LED ring. Do not neglect from gluing it otherwise any soft pressure on the LED's will push the whole ring back inside the casing. Pay attention to the lens board position and connectors assignments.
With the new LED ring in place, the clicking episodes should be -if not eliminated- greatly reduced.
You may still experiment some at times but of much shorter duration.
Obtaining an updated LED ring:
The LED ring can be purchased for ~6€ directly on eBay @ Andy.lig
I have contacted both Dericam and Cybernova and their current production already comes with the fix.
Update: see this new post for further resolution information.