Hi there what cable would You use for 3 garden spike light all max 150w lenght ich cable from transformer to haloogen 2,5meters . I want to go for an 1.0" flex cable, would You use one of this?
You are saying 0.75mm . I'm guessing they are 50 watt lamps . At 12 v the current is 4.1 amps, so the volt drop would be 0.57 amps @ 2.5 metres of 0.75 flex so is OK .
Don't forget that 12 volt lighting suffers from high volt drops.