New TV means a new chance of a proper and better looking fastening of adalight.
I decided to use those:
from: 45 degree LED mounting bracket for 12mm tricolor LEDs
and fix them with Velcro® fasteners, that have a sticky side. Here you see the TV:
It works very well, especially as you can easily change the spaces between individual lights.
Also the arduino got a casing and is fixed like the powersupply with Velcro® tape to the TV:
see also: Adalight