Triac transformers 12v
You can calculate the suitably dimmable triac transformer by telling you LEDtape watit/meter in the length of the tape, that is, if LED strip is 12W/m 12v And the tape you are installing is 3m, so 12W/m x 3m = 36W. Always choose about 20-30% higher standard voltage source, in this case 36W -> 50W 12V triac power supply.